<?php
/**
 * EGroupware - Mail - worker class
 *
 * @link http://www.egroupware.org
 * @package api
 * @subpackage amil
 * @author Stylite AG [info@stylite.de]
 * @copyright (c) 2013-2016 by Stylite AG <info-AT-stylite.de>
 * @license http://opensource.org/licenses/gpl-license.php GPL - GNU General Public License
 * @version $Id$
 */

namespace EGroupware\Api;

use Horde_Imap_Client;
use Horde_Imap_Client_Ids;
use Horde_Imap_Client_Fetch_Query;
use Horde_Imap_Client_Data_Fetch;
use Horde_Mime_Part;
use Horde_Imap_Client_Search_Query;
use Horde_Idna;
use Horde_Imap_Client_DateTime;
use Horde_Mime_Headers;
use Horde_Compress;
use Horde_Mime_Magic;
use Horde_Mail_Rfc822;
use Horde_Mail_Rfc822_List;
use Horde_Mime_Mdn;
use Horde_Translation;
use Horde_Translation_Handler_Gettext;
use EGroupware\Api;

use tidy;

/**
 * Mail worker class
 *  -provides backend functionality for all classes in Mail
 *  -provides classes that may be used by other apps too
 *
 * @link https://github.com/horde/horde/blob/master/imp/lib/Contents.php
 */
class Mail
{
	/**
	 * the current selected user profile
	 * @var int
	 */
	var $profileID = 0;

	/**
	 * delimiter - used to separate acc_id from mailbox / folder-tree-structure
	 *
	 * @var string
	 */
	const DELIMITER = '::';

	/**
	 * the current display char set
	 * @var string
	 */
	static $displayCharset;
	static $activeFolderCache;
	static $folderStatusCache;
	static $supportsORinQuery;

	/**
	 * Active preferences
	 *
	 * @var array
	 */
	var $mailPreferences;

	/**
	 * active html Options
	 *
	 * @var array
	 */
	var $htmlOptions;

	/**
	 * Active mimeType
	 *
	 * @var string
	 */
	var $activeMimeType;

	/**
	 * Active incomming (IMAP) Server Object
	 *
	 * @var Api\Mail\Imap
	 */
	var $icServer;

	/**
	 * Active outgoing (smtp) Server Object
	 *
	 * @var Api\Mail\Smtp
	 */
	var $ogServer;

	/**
	 * errorMessage
	 *
	 * @var string $errorMessage
	 */
	var $errorMessage;

	/**
	 * switch to enable debug; sometimes debuging is quite handy, to see things. check with the error log to see results
	 * @var boolean
	 */
	static $debug = false; //true;
	static $debugTimes = false; //true;

	/**
	 * static used to hold the mail Config values
	 * @array
	 */
	static $mailConfig;

	/**
	 * static used to configure tidy - if tidy is loadable, this config is used with tidy to straighten out html, instead of using purifiers tidy mode
	 *
	 * @array
	 */
	static $tidy_config = array('clean'=>false,'output-html'=>true,'join-classes'=>true,'join-styles'=>true,'show-body-only'=>"auto",'word-2000'=>true,'wrap'=>0);

	/**
	 * static used to configure htmLawed, for use with emails
	 *
	 * @array
	 */
	static $htmLawed_config = array('comment'=>1, //remove comments
		'make_tag_strict' => 3, // 3 is a new own config value, to indicate that transformation is to be performed, but don't transform font as size transformation of numeric sizes to keywords alters the intended result too much
		'keep_bad'=>2, //remove tags but keep element content (4 and 6 keep element content only if text (pcdata) is valid in parent element as per specs, this may lead to textloss if balance is switched on)
		// we switch the balance off because of some broken html mails contents get removed like (td in table), and let browser deal with it
		'balance'=>0,//turn off tag-balancing (config['balance']=>0). That will not introduce any security risk; only standards-compliant tag nesting check/filtering will be turned off (basic tag-balance will remain; i.e., there won't be any unclosed tag, etc., after filtering)
		'direct_list_nest' => 1,
		'allow_for_inline' => array('table','div','li','p'),//block elements allowed for nesting when only inline is allowed; Example span does not allow block elements as table; table is the only element tested so far
		// tidy eats away even some wanted whitespace, so we switch it off;
		// we used it for its compacting and beautifying capabilities, which resulted in better html for further processing
		'tidy'=>0,
		'elements' => "* -script -meta -object",
		'deny_attribute' => 'on*',
		'schemes'=>'href: file, ftp, http, https, mailto, phone, tel; src: cid, data, file, ftp, http, https; *:file, http, https, cid, src',
		'hook_tag' =>"hl_email_tag_transform",
	);

	/**
	 * static used define abbrevations for common access rights
	 *
	 * @array
	 */
	static $aclShortCuts = array('' => array('label'=>'none','title'=>'The user has no rights whatsoever.'),
		'lrs'		=> array('label'=>'readable','title'=>'Allows a user to read the contents of the mailbox.'),
		'lprs'		=> array('label'=>'post','title'=>'Allows a user to read the mailbox and post to it through the delivery system by sending mail to the submission address of the mailbox.'),
		'ilprs'		=> array('label'=>'append','title'=>'Allows a user to read the mailbox and append messages to it, either via IMAP or through the delivery system.'),
		'cdilprsw'	=> array('label'=>'write','title'=>'Allows a user to read the maibox, post to it, append messages to it, and delete messages or the mailbox itself. The only right not given is the right to change the ACL of the mailbox.'),
		'acdilprsw'	=> array('label'=>'all','title'=>'The user has all possible rights on the mailbox. This is usually granted to users only on the mailboxes they own.'),
		'custom'	=> array('label'=>'custom','title'=>'User defined combination of rights for the ACL'),
	);

	/**
	 * Folders that get automatic created AND get translated to the users language
	 * their creation is also controlled by users mailpreferences. if set to none / dont use folder
	 * the folder will not be automatically created. This is controlled in Mail->getFolderObjects
	 * so changing names here, must include a change of keywords there as well. Since these
	 * foldernames are subject to translation, keep that in mind too, if you change names here.
	 * lang('Drafts'), lang('Templates'), lang('Sent'), lang('Trash'), lang('Junk'), lang('Outbox')
	 * ActiveSync:
	 *  Outbox is needed by Nokia Clients to be able to send Mails
	 * @var array
	 */
	static $autoFolders = array('Drafts', 'Templates', 'Sent', 'Trash', 'Junk', 'Outbox');

	/**
	 * Array to cache the specialUseFolders, if existing
	 * @var array
	 */
	static $specialUseFolders;

	/**
	 * Hold instances by profileID for getInstance() singleton
	 *
	 * @var array
	 */
	private static $instances = array();
	private static $profileDefunct = array();

	/**
	 * Singleton for Mail
	 *
	 * @param boolean $_restoreSession = true
	 * @param int $_profileID = 0
	 * @param boolean $_validate = true - flag wether the profileid should be validated or not, if validation is true, you may receive a profile
	 *                                  not matching the input profileID, if we can not find a profile matching the given ID
	 * @param mixed boolean/object $_icServerObject - if object, return instance with object set as icServer
	 *												  immediately, if boolean === true use oldImapServer in constructor
	 * @param boolean $_reuseCache = null if null it is set to the value of $_restoreSession
	 * @return Mail
	 */
	public static function getInstance($_restoreSession=true, &$_profileID=0, $_validate=true, $_oldImapServerObject=false, $_reuseCache=null)
	{
		//$_restoreSession=false;
		if (!isset($_reuseCache)) $_reuseCache = $_restoreSession;
		//error_log(__METHOD__.' ('.__LINE__.') '.' RestoreSession:'.$_restoreSession.' ProfileId:'.$_profileID.'/'.Mail\Account::get_default_acc_id().' for user:'.$GLOBALS['egw_info']['user']['account_lid'].' called from:'.function_backtrace());
		//error_log(__METHOD__.' ('.__LINE__.') '.array2string($_oldImapServerObject));
		self::$profileDefunct = Cache::getCache(Cache::INSTANCE,'email','profileDefunct'.trim($GLOBALS['egw_info']['user']['account_id']),null,array(),5*1);
		if (isset(self::$profileDefunct[$_profileID]) && strlen(self::$profileDefunct[$_profileID]))
		{
			throw new Exception(__METHOD__." failed to instanciate Mail for Profile #$_profileID Reason:".self::$profileDefunct[$_profileID]);
		}
		if ($_oldImapServerObject instanceof Mail\Imap)
		{
			if (!isset(self::$instances[$_profileID]))
			{
				self::$instances[$_profileID] = new Mail('utf-8',false,$_profileID,false,$_reuseCache);
			}
			self::$instances[$_profileID]->icServer = $_oldImapServerObject;
			self::$instances[$_profileID]->accountid= $_oldImapServerObject->ImapServerId;
			self::$instances[$_profileID]->profileID= $_oldImapServerObject->ImapServerId;
			self::$instances[$_profileID]->mailPreferences = $GLOBALS['egw_info']['user']['preferences']['mail'];
			self::$instances[$_profileID]->htmlOptions  = self::$instances[$_profileID]->mailPreferences['htmlOptions'];
			return self::$instances[$_profileID];
		}
		if ($_profileID == 0)
		{
			if (isset($GLOBALS['egw_info']['user']['preferences']['mail']['ActiveProfileID']) && !empty($GLOBALS['egw_info']['user']['preferences']['mail']['ActiveProfileID']))
			{
				$profileID = (int)$GLOBALS['egw_info']['user']['preferences']['mail']['ActiveProfileID'];
			}
			else
			{
				$profileID = Mail\Account::get_default_acc_id();
			}
			if ($profileID!=$_profileID) $_restoreSession==false;
			$_profileID=$profileID;
			if (self::$debug) error_log(__METHOD__.' ('.__LINE__.') '.' called with profileID==0 using '.$profileID.' instead->'.function_backtrace());
		}
		// no validation or restoreSession for old ImapServer Object, just fetch it and return it
		if ($_oldImapServerObject===true)
		{
			return new Mail('utf-8',false,$_profileID,true,$_reuseCache);
		}
		if ($_profileID != 0 && $_validate)
		{
			$profileID = self::validateProfileID($_profileID);
			if ($profileID != $_profileID)
			{
				if (self::$debug)
				{
					error_log(__METHOD__.' ('.__LINE__.') '.' Validation of profile with ID:'.$_profileID.' failed. Using '.$profileID.' instead.');
					error_log(__METHOD__.' ('.__LINE__.') '.' # Instance='.$GLOBALS['egw_info']['user']['domain'].', User='.$GLOBALS['egw_info']['user']['account_lid']);
				}
				$_profileID = $profileID;
				//$GLOBALS['egw']->preferences->add('mail','ActiveProfileID',$_profileID,'user');
				// save prefs
				//$GLOBALS['egw']->preferences->save_repository(true);
			}
			//Cache::setSession('mail','activeProfileID',$_profileID);
		}
		//error_log(__METHOD__.' ('.__LINE__.') '.' RestoreSession:'.$_restoreSession.' ProfileId:'.$_profileID.' called from:'.function_backtrace());
		if ($_profileID && (!isset(self::$instances[$_profileID]) || $_restoreSession===false))
		{
			self::$instances[$_profileID] = new Mail('utf-8',$_restoreSession,$_profileID,false,$_reuseCache);
		}
		else
		{
			//refresh objects
			try
			{
				self::$instances[$_profileID]->icServer = Mail\Account::read($_profileID)->imapServer();
				self::$instances[$_profileID]->ogServer = Mail\Account::read($_profileID)->smtpServer();
				// TODO: merge mailprefs into userprefs, for easy treatment
				self::$instances[$_profileID]->mailPreferences = $GLOBALS['egw_info']['user']['preferences']['mail'];
				self::$instances[$_profileID]->htmlOptions  = self::$instances[$_profileID]->mailPreferences['htmlOptions'];
			} catch (\Exception $e)
			{
				$newprofileID = Mail\Account::get_default_acc_id();
				// try loading the default profile for the user
				error_log(__METHOD__.' ('.__LINE__.') '." Loading the Profile for ProfileID ".$_profileID.' failed for icServer; '.$e->getMessage().' Trigger new instance for Default-Profile '.$newprofileID.'. called from:'.function_backtrace());
				if ($newprofileID)
				{
					self::$instances[$newprofileID] = new Mail('utf-8',false,$newprofileID,false,$_reuseCache);
					$_profileID = $newprofileID;
				}
				else
				{
					throw new Exception(__METHOD__." failed to load the Profile for ProfileID for $_profileID with error:".$e->getMessage().($e->details?', '.$e->details:''));
				}
			}
			self::storeActiveProfileIDToPref(self::$instances[$_profileID]->icServer, $_profileID, $_validate );
		}
		self::$instances[$_profileID]->profileID = $_profileID;
		if (!isset(self::$instances[$_profileID]->idna2)) self::$instances[$_profileID]->idna2 = new Horde_Idna;
		//if ($_profileID==0); error_log(__METHOD__.' ('.__LINE__.') '.' RestoreSession:'.$_restoreSession.' ProfileId:'.$_profileID);
		if (!isset(self::$mailConfig)) self::$mailConfig = Config::read('mail');
		return self::$instances[$_profileID];
	}

	/**
	 * This method tries to fix alias address lacking domain part
	 * by trying to add domain part extracted from given reference address
	 *
	 * @param string $refrence email address to be used for domain extraction
	 * @param string $address alias address
	 *
	 * @return string returns alias address with appended default domain
	 */
	public static function fixInvalidAliasAddress($refrence, $address)
	{
		$parts = explode('@', $refrence);
		if (!strpos($address,'@') && !empty($parts[1])) $address .= '@'.$parts[1];
		return $address;
	}

	/**
	 * store given ProfileID to Session and pref
	 *
	 * @param int $_profileID = 0
	 * @param boolean $_testConnection = 0
	 * @return mixed $_profileID or false on failed ConnectionTest
	 */
	public static function storeActiveProfileIDToPref($_icServerObject, $_profileID=0, $_testConnection=true)
	{
		if (isset($GLOBALS['egw_info']['user']['preferences']['mail']['ActiveProfileID']) && !empty($GLOBALS['egw_info']['user']['preferences']['mail']['ActiveProfileID']))
		{
			$oldProfileID = (int)$GLOBALS['egw_info']['user']['preferences']['mail']['ActiveProfileID'];
		}
		if ($_testConnection)
		{
			try
			{
				$_icServerObject->getCurrentMailbox();
			}
			catch (\Exception $e)
			{
				if ($_profileID != Mail\Account::get_default_acc_id()) $_profileID = Mail\Account::get_default_acc_id();
				error_log(__METHOD__.__LINE__.' '.$e->getMessage());
				return false;
			}
		}
		if ($oldProfileID != $_profileID)
		{
			if ($oldProfileID && $_profileID==0) $_profileID = $oldProfileID;
			$GLOBALS['egw']->preferences->add('mail','ActiveProfileID',$_profileID,'user');
			// save prefs
			$GLOBALS['egw']->preferences->save_repository(true);
			$GLOBALS['egw_info']['user']['preferences']['mail']['ActiveProfileID'] = $_profileID;
			Cache::setSession('mail','activeProfileID',$_profileID);
		}
		return $_profileID;
	}

	/**
	 * Validate given account acc_id to make sure account is valid for current user
	 *
	 * Validation checks:
	 * - non-empty imap-host
	 * - non-empty imap-username
	 *
	 * @param int $_acc_id = 0
	 * @return int validated acc_id -> either acc_id given, or first valid one
	 */
	public static function validateProfileID($_acc_id=0)
	{
		if ($_acc_id)
		{
			try {
				$account = Mail\Account::read($_acc_id);
				if ($account->is_imap())
				{
					return $_acc_id;
				}
				if (self::$debug) error_log(__METHOD__."($_acc_id) account NOT valid, no imap-host!");
			}
			catch (\Exception $e) {
				unset($e);
				if (self::$debug) error_log(__METHOD__."($_acc_id) account NOT found!");
			}
		}
		// no account specified or specified account not found or not valid
		// --> search existing account for first valid one and return that
		foreach(Mail\Account::search($only_current_user=true, 'acc_imap_host') as $acc_id => $imap_host)
		{
			if (!empty($imap_host) && ($account = Mail\Account::read($acc_id)) && $account->is_imap())
			{
				if (self::$debug && $_acc_id) error_log(__METHOD__."($_acc_id) using $acc_id instead");
				return $acc_id;
			}
		}
		if (self::$debug) error_log(__METHOD__."($_acc_id) NO valid account found!");
		return 0;
	}


	/**
	 * Private constructor, use Mail::getInstance() instead
	 *
	 * @param string $_displayCharset = 'utf-8'
	 * @param boolean $_restoreSession = true
	 * @param int $_profileID = 0 if not nummeric, we assume we only want an empty class object
	 * @param boolean $_oldImapServerObject = false
	 * @param boolean $_reuseCache = null if null it is set to the value of $_restoreSession
	 */
	private function __construct($_displayCharset='utf-8',$_restoreSession=true, $_profileID=0, $_oldImapServerObject=false, $_reuseCache=null)
	{
		if (!isset($_reuseCache)) $_reuseCache = $_restoreSession;
		if (!empty($_displayCharset)) self::$displayCharset = $_displayCharset;
		// not nummeric, we assume we only want an empty class object
		if (!is_numeric($_profileID)) return;
		if ($_restoreSession)
		{
			//error_log(__METHOD__." Session restore ".function_backtrace());
			$this->restoreSessionData();
		}
		else
		{
			$this->restoreSessionData();
			$this->sessionData = array();
		}
		if (!$_reuseCache) $this->forcePrefReload($_profileID,!$_reuseCache);
		try
		{
			$this->profileID = self::validateProfileID($_profileID);
			$this->accountid	= $GLOBALS['egw_info']['user']['account_id'];

			//error_log(__METHOD__.' ('.__LINE__.') '." ProfileID ".$this->profileID.' called from:'.function_backtrace());
			$acc = Mail\Account::read($this->profileID);
		}
		catch (\Exception $e)
		{
			throw new Exception(__METHOD__." failed to instanciate Mail for $_profileID / ".$this->profileID." with error:".$e->getMessage());
		}
		//error_log(__METHOD__.' ('.__LINE__.') '.array2string($acc->imapServer()));
		$this->icServer = ($_oldImapServerObject?$acc->oldImapServer():$acc->imapServer());
		$this->ogServer = $acc->smtpServer();
		// TODO: merge mailprefs into userprefs, for easy treatment
		$this->mailPreferences = $GLOBALS['egw_info']['user']['preferences']['mail'];
		$this->htmlOptions  = $this->mailPreferences['htmlOptions'];
		if (isset($this->icServer->ImapServerId) && !empty($this->icServer->ImapServerId))
		{
			$_profileID = $this->profileID = $GLOBALS['egw_info']['user']['preferences']['mail']['ActiveProfileID'] = $this->icServer->ImapServerId;
		}

		if (!isset(self::$mailConfig)) self::$mailConfig = Config::read('mail');
	}

	/**
	 * forceEAProfileLoad
	 * used to force the load of a specific emailadmin profile; we assume administrative use only (as of now)
	 * @param int $_profile_id
	 * @return object instance of Mail (by reference)
	 */
	public static function &forceEAProfileLoad($_profile_id)
	{
		self::unsetCachedObjects($_profile_id);
		$mail = self::getInstance(false, $_profile_id,false);
		//_debug_array( $_profile_id);
		$mail->icServer = Mail\Account::read($_profile_id)->imapServer();
		$mail->ogServer = Mail\Account::read($_profile_id)->smtpServer();
		return $mail;
	}

	/**
	 * trigger the force of the reload of the SessionData by resetting the session to an empty array
	 * @param int $_profile_id
	 * @param boolean $_resetFolderObjects
	 */
	public static function forcePrefReload($_profile_id=null,$_resetFolderObjects=true)
	{
		// unset the mail_preferences session object, to force the reload/rebuild
		Cache::setSession('mail','mail_preferences',serialize(array()));
		Cache::setSession('emailadmin','session_data',serialize(array()));
		if ($_resetFolderObjects) self::resetFolderObjectCache($_profile_id);
	}

	/**
	 * restore the SessionData
	 */
	function restoreSessionData()
	{
		$this->sessionData = array();
		self::$activeFolderCache = Cache::getCache(Cache::INSTANCE,'email','activeMailbox'.trim($GLOBALS['egw_info']['user']['account_id']),null,array(),60*60*10);
		if (!empty(self::$activeFolderCache[$this->profileID]))
		{
			foreach (self::$activeFolderCache[$this->profileID] as $key => $value)
			{
				$this->sessionData[$key] = $value;
			}
		}
	}

	/**
	 * saveSessionData saves session data
	 */
	function saveSessionData()
	{
		//error_log(__METHOD__.' ('.__LINE__.') '.array2string(array_keys($this->sessionData)));
		foreach ($this->sessionData as $key => $value)
		{
			if (!is_array(self::$activeFolderCache) && empty(self::$activeFolderCache[$this->profileID]))
			{
				self::$activeFolderCache = array($this->profileID => array($key => $value));
			}
			else if(empty(self::$activeFolderCache[$this->profileID]))
			{
				self::$activeFolderCache += array($this->profileID => array($key => $value));
			}
			else
			{
				self::$activeFolderCache[$this->profileID] =  array_merge(self::$activeFolderCache[$this->profileID], array($key => $value));
			}
		}

		if (isset(self::$activeFolderCache) && is_array(self::$activeFolderCache))
		{
			Cache::setCache(Cache::INSTANCE,'email','activeMailbox'.trim($GLOBALS['egw_info']['user']['account_id']),self::$activeFolderCache, 60*60*10);
		}
		// no need to block session any longer
		$GLOBALS['egw']->session->commit_session();
	}

	/**
	 * unset certain CachedObjects for the given profile id, unsets the profile for default ID=0 as well
	 *
	 * 1) icServerIMAP_connectionError
	 * 2) icServerSIEVE_connectionError
	 * 3) INSTANCE OF MAIL_BO
	 * 4) HierarchyDelimiter
	 * 5) VacationNotice
	 *
	 * @param int $_profileID = null default profile of user as returned by getUserDefaultProfileID
	 * @return void
	 */
	static function unsetCachedObjects($_profileID=null)
	{
		if (!isset($_profileID)) $_profileID = Mail\Account::get_default_acc_id();
		if (is_array($_profileID) && $_profileID['account_id']) $account_id = $_profileID['account_id'];
		//error_log(__METHOD__.__LINE__.' called with ProfileID:'.array2string($_profileID).' from '.function_backtrace());
		if (!is_array($_profileID) && (is_numeric($_profileID) || !(stripos($_profileID,'tracker_')===false)))
		{
			self::resetConnectionErrorCache($_profileID);
			$rawHeadersCache = Cache::getCache(Cache::INSTANCE,'email','rawHeadersCache'.trim($account_id),$callback=null,$callback_params=array(),$expiration=60*60*1);
			if (isset($rawHeadersCache[$_profileID]))
			{
				unset($rawHeadersCache[$_profileID]);
				Cache::setCache(Cache::INSTANCE,'email','rawHeadersCache'.trim($account_id),$rawHeadersCache, $expiration=60*60*1);
			}
			$HierarchyDelimiterCache = Cache::getCache(Cache::INSTANCE,'email','HierarchyDelimiter'.trim($account_id),$callback=null,$callback_params=array(),$expiration=60*60*24*5);
			if (isset($HierarchyDelimiterCache[$_profileID]))
			{
				unset($HierarchyDelimiterCache[$_profileID]);
				Cache::setCache(Cache::INSTANCE,'email','HierarchyDelimiter'.trim($account_id),$HierarchyDelimiterCache, $expiration=60*60*24*5);
			}
			//reset folderObject cache, to trigger reload
			self::resetFolderObjectCache($_profileID);
			//reset counter of deleted messages per folder
			$eMailListContainsDeletedMessages = Cache::getCache(Cache::INSTANCE,'email','eMailListContainsDeletedMessages'.trim($account_id),$callback=null,$callback_params=array(),$expiration=60*60*1);
			if (isset($eMailListContainsDeletedMessages[$_profileID]))
			{
				unset($eMailListContainsDeletedMessages[$_profileID]);
				Cache::setCache(Cache::INSTANCE,'email','eMailListContainsDeletedMessages'.trim($account_id),$eMailListContainsDeletedMessages, $expiration=60*60*1);
			}
			$vacationCached = Cache::getCache(Cache::INSTANCE, 'email', 'vacationNotice'.trim($account_id),$callback=null,$callback_params=array(),$expiration=60*60*24*1);
			if (isset($vacationCached[$_profileID]))
			{
				unset($vacationCached[$_profileID]);
				Cache::setCache(Cache::INSTANCE,'email','vacationNotice'.trim($account_id),$vacationCached, $expiration=60*60*24*1);
			}

			if (isset(self::$instances[$_profileID])) unset(self::$instances[$_profileID]);
		}
		if (is_array($_profileID) && $_profileID['location'] == 'clear_cache')
		{
			// called via hook
			foreach($GLOBALS['egw']->accounts->search(array('type' => 'accounts','order' => 'account_lid')) as $account)
			{
				//error_log(__METHOD__.__LINE__.array2string($account));
				$account_id = $account['account_id'];
				$_profileID = null;
				self::resetConnectionErrorCache($_profileID,$account_id);
				self::resetFolderObjectCache($_profileID,$account_id);
				Cache::setCache(Cache::INSTANCE,'email','rawHeadersCache'.trim($account_id),array(), 60*60*1);
				Cache::setCache(Cache::INSTANCE,'email','HierarchyDelimiter'.trim($account_id),array(), 60*60*24*5);
				Cache::setCache(Cache::INSTANCE,'email','eMailListContainsDeletedMessages'.trim($account_id),array(), 60*60*1);
				Cache::setCache(Cache::INSTANCE,'email','vacationNotice'.trim($account_id),array(), 60*60*24*1);
			}
		}
	}

	/**
	 * resets the various cache objects where connection error Objects may be cached
	 *
	 * @param int $_ImapServerId the profileID to look for
	 * @param int $account_id the egw account to look for
	 */
	static function resetConnectionErrorCache($_ImapServerId=null,$account_id=null)
	{
		//error_log(__METHOD__.' ('.__LINE__.') '.' for Profile:'.array2string($_ImapServerId) .' for user:'.trim($account_id));
		if (!isset($account_id)) $account_id = $GLOBALS['egw_info']['user']['account_id'];
		if (is_array($_ImapServerId))
		{
			// called via hook
			$account_id = $_ImapServerId['account_id'];
			unset($_ImapServerId);
			$_ImapServerId = null;
		}
		if (!isset($_ImapServerId))
		{
			$isConError = array();
			$waitOnFailure = array();
		}
		else
		{
			$isConError = Cache::getCache(Cache::INSTANCE,'email','icServerSIEVE_connectionError'.trim($account_id));
			if (isset($isConError[$_ImapServerId]))
			{
				unset($isConError[$_ImapServerId]);
			}
			$waitOnFailure = Cache::getCache(Cache::INSTANCE,'email','ActiveSyncWaitOnFailure'.trim($account_id),null,array(),60*60*2);
			if (isset($waitOnFailure[$_ImapServerId]))
			{
				unset($waitOnFailure[$_ImapServerId]);
			}
		}
		Cache::setCache(Cache::INSTANCE,'email','icServerSIEVE_connectionError'.trim($account_id),$isConError,60*15);
		Cache::setCache(Cache::INSTANCE,'email','ActiveSyncWaitOnFailure'.trim($account_id),$waitOnFailure,60*60*2);
	}

	/**
	 * resets the various cache objects where Folder Objects may be cached
	 *
	 * @param int $_ImapServerId the profileID to look for
	 * @param int $account_id the egw account to look for
	 */
	static function resetFolderObjectCache($_ImapServerId=null,$account_id=null)
	{
		//error_log(__METHOD__.' ('.__LINE__.') '.' called for Profile:'.array2string($_ImapServerId).'->'.function_backtrace());
		if (!isset($account_id)) $account_id = $GLOBALS['egw_info']['user']['account_id'];
		// on [location] => verify_settings we coud either use [prefs] => Array([ActiveProfileID] => 9, .. as $_ImapServerId
		// or treat it as not given. we try that path
		if (!isset($_ImapServerId)||is_array($_ImapServerId))
		{
			$folders2return = array();
			$folderInfo = array();
			$folderBasicInfo = array();
			$_specialUseFolders = array();
		}
		else
		{
			$folders2return = Cache::getCache(Cache::INSTANCE,'email','folderObjects'.trim($account_id),null,array(),60*60*1);
			if (!empty($folders2return) && isset($folders2return[$_ImapServerId]))
			{
				unset($folders2return[$_ImapServerId]);
			}
			$folderInfo = Cache::getCache(Cache::INSTANCE,'email','icServerFolderExistsInfo'.trim($account_id),null,array(),60*60*5);
			if (!empty($folderInfo) && isset($folderInfo[$_ImapServerId]))
			{
				unset($folderInfo[$_ImapServerId]);
			}
			/*
			$lastFolderUsedForMove = Cache::getCache(Cache::INSTANCE,'email','lastFolderUsedForMove'.trim($account_id),null,array(),$expiration=60*60*1);
			if (isset($lastFolderUsedForMove[$_ImapServerId]))
			{
				unset($lastFolderUsedForMove[$_ImapServerId]);
			}
			*/
			$folderBasicInfo = Cache::getCache(Cache::INSTANCE,'email','folderBasicInfo'.trim($account_id),null,array(),60*60*1);
			if (!empty($folderBasicInfo) && isset($folderBasicInfo[$_ImapServerId]))
			{
				unset($folderBasicInfo[$_ImapServerId]);
			}
			$_specialUseFolders = Cache::getCache(Cache::INSTANCE,'email','specialUseFolders'.trim($account_id),null,array(),60*60*12);
			if (!empty($_specialUseFolders) && isset($_specialUseFolders[$_ImapServerId]))
			{
				unset($_specialUseFolders[$_ImapServerId]);
				self::$specialUseFolders=null;
			}
		}
		Cache::setCache(Cache::INSTANCE,'email','folderObjects'.trim($account_id),$folders2return, 60*60*1);
		Cache::setCache(Cache::INSTANCE,'email','icServerFolderExistsInfo'.trim($account_id),$folderInfo,60*60*5);
		//Cache::setCache(Cache::INSTANCE,'email','lastFolderUsedForMove'.trim($account_id),$lastFolderUsedForMove,$expiration=60*60*1);
		Cache::setCache(Cache::INSTANCE,'email','folderBasicInfo'.trim($account_id),$folderBasicInfo,60*60*1);
		Cache::setCache(Cache::INSTANCE,'email','specialUseFolders'.trim($account_id),$_specialUseFolders,60*60*12);
	}

	/**
	 * checks if the imap server supports a given capability
	 *
	 * @param string $_capability the name of the capability to check for
	 * @return bool
	 */
	function hasCapability($_capability)
	{
		$rv = $this->icServer->hasCapability(strtoupper($_capability));
		//error_log(__METHOD__.' ('.__LINE__.') '." $_capability:".array2string($rv));
		return $rv;
	}

	/**
	 * getUserEMailAddresses - function to gather the emailadresses connected to the current mail-account
	 * @param string $_profileID the ID of the mailaccount to check for identities, if null current mail-account is used
	 * @return array - array(email=>realname)
	 */
	function getUserEMailAddresses($_profileID=null)
	{
		$acc = Mail\Account::read((!empty($_profileID)?$_profileID:$this->profileID));
		//error_log(__METHOD__.' ('.__LINE__.') '.':'.array2string($acc));
		$identities = Mail\Account::identities($acc);

		$userEMailAdresses = array($acc['ident_email']=>$acc['ident_realname']);

		foreach($identities as $ik => $ident) {
			//error_log(__METHOD__.' ('.__LINE__.') '.':'.$ik.'->'.array2string($ident));
			$identity = Mail\Account::read_identity($ik);
			if (!empty($identity['ident_email']) && !isset($userEMailAdresses[$identity['ident_email']])) $userEMailAdresses[$identity['ident_email']] = $identity['ident_realname'];
		}
		//error_log(__METHOD__.' ('.__LINE__.') '.array2string($userEMailAdresses));
		return $userEMailAdresses;
	}

	/**
	 * getAllIdentities - function to gather the identities connected to the current user
	 * @param string/int $_accountToSearch = null if set search accounts for user specified
	 * @param boolean $resolve_placeholders wether or not resolve possible placeholders in identities
	 * @return array - array(email=>realname)
	 */
	static function getAllIdentities($_accountToSearch=null,$resolve_placeholders=false)
	{
		$userEMailAdresses = array();
		foreach(Mail\Account::search($only_current_user=($_accountToSearch?$_accountToSearch:true), $just_name=true) as $acc_id => $identity_name)
		{
			$acc = Mail\Account::read($acc_id,($_accountToSearch?$_accountToSearch:null));
			if (!$resolve_placeholders) $userEMailAdresses[$acc['ident_id']] = array('acc_id'=>$acc_id,'ident_id'=>$acc['ident_id'],'ident_email'=>$acc['ident_email'],'ident_org'=>$acc['ident_org'],'ident_realname'=>$acc['ident_realname'],'ident_signature'=>$acc['ident_signature'],'ident_name'=>$acc['ident_name']);

			foreach(Mail\Account::identities($acc) as $ik => $ident) {
				//error_log(__METHOD__.' ('.__LINE__.') '.':'.$ik.'->'.array2string($ident));
				$identity = Mail\Account::read_identity($ik,$resolve_placeholders);
				//error_log(__METHOD__.' ('.__LINE__.') '.':'.$ik.'->'.array2string($identity));
				if (!isset($userEMailAdresses[$identity['ident_id']])) $userEMailAdresses[$identity['ident_id']] = array('acc_id'=>$acc_id,'ident_id'=>$identity['ident_id'],'ident_email'=>$identity['ident_email'],'ident_org'=>$identity['ident_org'],'ident_realname'=>$identity['ident_realname'],'ident_signature'=>$identity['ident_signature'],'ident_name'=>$identity['ident_name']);
			}
		}
		//error_log(__METHOD__.' ('.__LINE__.') '.array2string($userEMailAdresses));
		return $userEMailAdresses;
	}

	/**
	 * Get all identities of given mailaccount
	 *
	 * @param int|Mail\Account $account account-object or acc_id
	 * @return array - array(email=>realname)
	 */
	function getAccountIdentities($account)
	{
		if (!$account instanceof Mail\Account)
		{
			$account = Mail\Account::read($account);
		}
		$userEMailAdresses = array();
		foreach(Mail\Account::identities($account, true, 'params') as $ik => $ident) {
			//error_log(__METHOD__.' ('.__LINE__.') '.':'.$ik.'->'.array2string($ident));
			$identity = Mail\Account::read_identity($ik,true,null,$account);
			//error_log(__METHOD__.' ('.__LINE__.') '.':'.$ik.'->'.array2string($identity));
			// standardIdentity has ident_id==acc_id (as it is done within account->identities)
			if (empty($identity['ident_id'])) $identity['ident_id'] = $identity['acc_id'];
			if (!isset($userEMailAdresses[$identity['ident_id']]))
			{
				$userEMailAdresses[$identity['ident_id']] = array('acc_id'=>$identity['acc_id'],
																'ident_id'=>$identity['ident_id'],
																'ident_email'=>$identity['ident_email'],
																'ident_org'=>$identity['ident_org'],
																'ident_realname'=>$identity['ident_realname'],
																'ident_signature'=>$identity['ident_signature'],
																'ident_name'=>$identity['ident_name']);
			}
		}

		return $userEMailAdresses;
	}

	/**
	 * Function to gather the default identitiy connected to the current mailaccount
	 *
	 * @return int - id of the identity
	 */
	function getDefaultIdentity()
	{
		// retrieve the signature accociated with the identity
		$_accountData=array();
		$id = $this->getIdentitiesWithAccounts($_accountData);
		foreach(Mail\Account::identities($_accountData[$this->profileID] ?
			$this->profileID : $_accountData[$id],false,'ident_id') as $accountData)
		{
			return $accountData;
		}
	}

	/**
	 * getIdentitiesWithAccounts
	 *
	 * @param array reference to pass all identities back
	 * @return int the default Identity (active) or 0
	 */
	function getIdentitiesWithAccounts(&$identities)
	{
		// account select box
		$selectedID = $this->profileID;
		$allAccountData = Mail\Account::search($only_current_user=true, false, null);
		if ($allAccountData) {
			$rememberFirst=$selectedFound=null;
			foreach ($allAccountData as $tmpkey => $icServers)
			{
				if (!isset($rememberFirst)) $rememberFirst = $tmpkey;
				if ($tmpkey == $selectedID) $selectedFound=true;
				//error_log(__METHOD__.' ('.__LINE__.') '.' Key:'.$tmpkey.'->'.array2string($icServers->acc_imap_host));
				$host = $icServers->acc_imap_host;
				if (empty($host)) continue;
				$identities[$icServers->acc_id] = $icServers['ident_realname'].' '.$icServers['ident_org'].' <'.$icServers['ident_email'].'>';
				//error_log(__METHOD__.' ('.__LINE__.') '.' Key:'.$tmpkey.'->'.array2string($identities[$icServers->acc_id]));
			}
		}
		return ($selectedFound?$selectedID:$rememberFirst);
	}

	/**
	 * construct the string representing an Identity passed by $identity
	 *
	 * @var array/object $identity, identity object that holds realname, organization, emailaddress and signatureid
	 * @var boolean $fullString full or false=NamePart only is returned
	 * @return string - constructed of identity object data as defined in mailConfig
	 */
	static function generateIdentityString($identity, $fullString=true)
	{
		//error_log(__METHOD__.' ('.__LINE__.') '.array2string($identity));
		//if (!isset(self::$mailConfig)) self::$mailConfig = Config::read('mail');
		// not set? -> use default, means full display of all available data
		//if (!isset(self::$mailConfig['how2displayIdentities'])) self::$mailConfig['how2displayIdentities']='';
		$how2displayIdentities = '';
		switch ($how2displayIdentities)
		{
			case 'email';
				//$retData = str_replace('@',' ',$identity->emailAddress).($fullString===true?' <'.$identity->emailAddress.'>':'');
				$retData = $identity['ident_email'].($fullString===true?' <'.$identity['ident_email'].'>':'');
				break;
			case 'nameNemail';
				$retData = (!empty($identity['ident_realname'])?$identity['ident_realname']:substr_replace($identity['ident_email'],'',strpos($identity['ident_email'],'@'))).($fullString===true?' <'.$identity['ident_email'].'>':'');
				break;
			case 'orgNemail';
				$retData = (!empty($identity['ident_org'])?$identity['ident_org']:substr_replace($identity['ident_email'],'',0,strpos($identity['ident_email'],'@')+1)).($fullString===true?' <'.$identity['ident_email'].'>':'');
				break;
			default:
				$retData = $identity['ident_realname'].(!empty($identity['ident_org'])?' '.$identity['ident_org']:'').($fullString===true?' <'.$identity['ident_email'].'>':'');
		}
		return $retData;
	}

	/**
	 * closes a connection on the active Server ($this->icServer)
	 *
	 * @return void
	 */
	function closeConnection()
	{
		//if ($icServer->_connected) error_log(__METHOD__.' ('.__LINE__.') '.' disconnect from Server');
		//error_log(__METHOD__."() ".function_backtrace());
		$this->icServer->disconnect();
	}

	/**
	 * reopens a connection for the active Server ($this->icServer), and selects the folder given
	 *
	 * @param string $_foldername folder to open/select
	 * @return void
	 */
	function reopen($_foldername)
	{
		if (self::$debugTimes) $starttime = microtime (true);

		//error_log(__METHOD__.' ('.__LINE__.') '."('$_foldername') ".function_backtrace());
		// TODO: trying to reduce traffic to the IMAP Server here, introduces problems with fetching the bodies of
		// eMails when not in "current-Folder" (folder that is selected by UI)
		static $folderOpened;
		//if (empty($folderOpened) || $folderOpened!=$_foldername)
		//{
			//error_log( __METHOD__.' ('.__LINE__.') '." $_foldername ".function_backtrace());
			//error_log(__METHOD__.' ('.__LINE__.') '.' Connected with icServer for Profile:'.$this->profileID.'?'.print_r($this->icServer->_connected,true));
			if ($this->folderIsSelectable($_foldername)) {
				$this->icServer->openMailbox($_foldername);
			}
			$folderOpened = $_foldername;
		//}
		if (self::$debugTimes) self::logRunTimes($starttime,null,'Folder:'.$_foldername,__METHOD__.' ('.__LINE__.') ');
	}


	/**
	 * openConnection
	 *
	 * @param int $_icServerID = 0
	 * @throws Horde_Imap_Client_Exception on connection error or authentication failure
	 * @throws InvalidArgumentException on missing credentials
	 */
	function openConnection($_icServerID=0)
	{
		//error_log( "-------------------------->open connection ".function_backtrace());
		//error_log(__METHOD__.' ('.__LINE__.') '.' ->'.array2string($this->icServer));
		if (self::$debugTimes) $starttime = microtime (true);
		$mailbox=null;
		try
		{
			if(isset($this->sessionData['mailbox'])&&$this->folderExists($this->sessionData['mailbox'])) $mailbox = $this->sessionData['mailbox'];
			if (empty($mailbox)) $mailbox = $this->icServer->getCurrentMailbox();
/*
			if (isset(Mail\Imap::$supports_keywords[$_icServerID]))
			{
				$this->icServer->openMailbox($mailbox);
			}
			else
			{
				$this->icServer->examineMailbox($mailbox);
			}
*/
			// the above should detect if there is a known information about supporting KEYWORDS
			// but does not work as expected :-(
			$this->icServer->examineMailbox($mailbox);
			//error_log(__METHOD__." using existing Connection ProfileID:".$_icServerID.' Status:'.print_r($this->icServer->_connected,true));
			//error_log(__METHOD__.' ('.__LINE__.') '."->open connection for Server with profileID:".$_icServerID.function_backtrace());

			//make sure we are working with the correct hierarchyDelimiter on the current connection, calling getHierarchyDelimiter with false to reset the cache
			$this->getHierarchyDelimiter(false);
			self::$specialUseFolders = $this->getSpecialUseFolders();
		}
		catch (\Exception $e)
		{
			error_log(__METHOD__.' ('.__LINE__.') '."->open connection for Server with profileID:".$_icServerID." trying to examine ($mailbox) failed!".$e->getMessage());
			throw new Exception(__METHOD__." failed to ".__METHOD__." on Profile to $_icServerID while trying to examine $mailbox:".$e->getMessage());
		}
		if (self::$debugTimes) self::logRunTimes($starttime,null,'ProfileID:'.$_icServerID,__METHOD__.' ('.__LINE__.') ');
	}

	/**
	 * getQuotaRoot
	 * return the qouta of the users INBOX
	 *
	 * @return mixed array/boolean
	 */
	function getQuotaRoot()
	{
		static $quota;
		if (isset($quota)) return $quota;
		if (isset(self::$profileDefunct[$this->profileID]) && strlen(self::$profileDefunct[$this->profileID]))
		{
			// something is wrong. Do not proceed. either no folder or profile is marked as defunct for this request
			return false;
		}
		try
		{
			$this->icServer->getCurrentMailbox();
			if(!$this->icServer->hasCapability('QUOTA')) {
				$quota = false;
				return false;
			}
			$quota = $this->icServer->getStorageQuotaRoot('INBOX');
		}
		catch (Exception $e)
		{
			//error_log(__METHOD__.array2string($e));
			//error_log(__METHOD__." failed to fetch quota on ".$this->profileID.' Reason:'.$e->getMessage().($e->details?', '.$e->details:'')/*.function_backtrace()*/);
			if ($e->getCode()==102)
			{
				self::$profileDefunct[$this->profileID]=$e->getMessage().($e->details?', '.$e->details:'');
				Cache::setCache(Cache::INSTANCE,'email','profileDefunct'.trim($GLOBALS['egw_info']['user']['account_id']),self::$profileDefunct, $expiration=5*1);
				throw new Exception(__METHOD__." failed to fetch quota on ".$this->profileID.' Reason:'.$e->getMessage().($e->details?', '.$e->details:''));
			}
		}
		//error_log(__METHOD__.' ('.__LINE__.') '.array2string($quota));
		if(is_array($quota)) {
			$quota = array(
				'usage'	=> $quota['USED'],
				'limit'	=> $quota['QMAX'],
			);
		} else {
			$quota = false;
		}
		return $quota;
	}

	/**
	 * getTimeOut
	 *
	 * @param string _use decide if the use is for IMAP or SIEVE, by now only the default differs
	 *
	 * @return int - timeout (either set or default 20/10)
	 */
	static function getTimeOut($_use='IMAP')
	{
		return $_use=='SIEVE' ? 10 : 20; // this is the default value
	}

	/**
	 * Fetch the namespace from icServer
	 *
	 * An IMAPServer may present several namespaces under each key:
	 * so we return an array of namespacearrays for our needs
	 *
	 * @return array array(prefix_present=>mixed (bool/string) ,prefix=>string,delimiter=>string,type=>string (personal|others|shared))
	 */
	function _getNameSpaces()
	{
		static $nameSpace = null;
		$foldersNameSpace = array();
		$delimiter = $this->getHierarchyDelimiter();
		// TODO: cache by $this->icServer->ImapServerId
		if (!isset($nameSpace)) $nameSpace = $this->icServer->getNameSpaceArray();
		//error_log(__METHOD__.' ('.__LINE__.') '.array2string($nameSpace));
		if (is_array($nameSpace)) {
			foreach($nameSpace as $type => $singleNameSpaceArray)
			{
				foreach ($singleNameSpaceArray as $singleNameSpace)
				{
					$_foldersNameSpace = array();
					if($type == 'personal' && $singleNameSpace['name'] == '#mh/' && ($this->folderExists('Mail')||$this->folderExists('INBOX')))
					{
						$_foldersNameSpace['prefix_present'] = 'forced';
						// uw-imap server with mailbox prefix or dovecot maybe
						$_foldersNameSpace['prefix'] = ($this->folderExists('Mail')?'Mail':(!empty($singleNameSpace['name'])?$singleNameSpace['name']:''));
					}
					elseif($type == 'personal' && ($singleNameSpace['name'] == '#mh/') && $this->folderExists('mail'))
					{
						$_foldersNameSpace['prefix_present'] = 'forced';
						// uw-imap server with mailbox prefix or dovecot maybe
						$_foldersNameSpace['prefix'] = 'mail';
					} else {
						$_foldersNameSpace['prefix_present'] = !empty($singleNameSpace['name']);
						$_foldersNameSpace['prefix'] = $singleNameSpace['name'];
					}
					$_foldersNameSpace['delimiter'] = ($singleNameSpace['delimiter']?$singleNameSpace['delimiter']:$delimiter);
					$_foldersNameSpace['type'] = $type;
					$foldersNameSpace[] =$_foldersNameSpace;
				}
				//echo "############## $type->".print_r($foldersNameSpace[$type],true)." ###################<br>";
			}
		}
		//error_log(__METHOD__.' ('.__LINE__.') '.array2string($foldersNameSpace));
		return $foldersNameSpace;
	}

	/**
	 * Wrapper to extract the folder prefix from folder compared to given namespace array
	 *
	 * @param array $nameSpace
	 * @paam string $_folderName
	 * @return string the prefix (may be an empty string)
	 */
	function getFolderPrefixFromNamespace($nameSpace, $folderName)
	{
		foreach($nameSpace as &$singleNameSpace)
		{
			//if (substr($singleNameSpace['prefix'],0,strlen($folderName))==$folderName) return $singleNameSpace['prefix'];
			if (substr($folderName,0,strlen($singleNameSpace['prefix']))==$singleNameSpace['prefix']) return $singleNameSpace['prefix'];
		}
		return "";
	}

	/**
	 * getHierarchyDelimiter
	 *
	 * @var boolean $_useCache
	 * @return string the hierarchyDelimiter
	 */
	function getHierarchyDelimiter($_useCache=true)
	{
		static $HierarchyDelimiter = null;
		if (!isset($HierarchyDelimiter)) $HierarchyDelimiter = Cache::getCache(Cache::INSTANCE,'email','HierarchyDelimiter'.trim($GLOBALS['egw_info']['user']['account_id']),null,array(),60*60*24*5);
		if ($_useCache===false) unset($HierarchyDelimiter[$this->icServer->ImapServerId]);
		if (isset($HierarchyDelimiter[$this->icServer->ImapServerId])&&!empty($HierarchyDelimiter[$this->icServer->ImapServerId]))
		{
			return $HierarchyDelimiter[$this->icServer->ImapServerId];
		}
		$HierarchyDelimiter[$this->icServer->ImapServerId] = '/';
		try
		{
			$this->icServer->getCurrentMailbox();
			$HierarchyDelimiter[$this->icServer->ImapServerId] = $this->icServer->getDelimiter();
		}
		catch(\Exception $e)
		{
			if ($e->getCode()==102)
			{
				self::$profileDefunct[$this->profileID]=$e->getMessage().($e->details?', '.$e->details:'');
				Cache::setCache(Cache::INSTANCE,'email','profileDefunct'.trim($GLOBALS['egw_info']['user']['account_id']),self::$profileDefunct, $expiration=5*1);
			}
			unset($e);
			$HierarchyDelimiter[$this->icServer->ImapServerId] = '/';
		}
		Cache::setCache(Cache::INSTANCE,'email','HierarchyDelimiter'.trim($GLOBALS['egw_info']['user']['account_id']),$HierarchyDelimiter, 60*60*24*5);
		return $HierarchyDelimiter[$this->icServer->ImapServerId];
	}

	/**
	 * getSpecialUseFolders
	 * @ToDo: could as well be static, when icServer is passed
	 * @return mixed null/array
	 */
	function getSpecialUseFolders()
	{
		//error_log(__METHOD__.' ('.__LINE__.') '.':'.$this->icServer->ImapServerId.' Connected:'.$this->icServer->_connected);
		static $_specialUseFolders = null;
		if (!isset($_specialUseFolders)||empty($_specialUseFolders)) $_specialUseFolders = Cache::getCache(Cache::INSTANCE,'email','specialUseFolders'.trim($GLOBALS['egw_info']['user']['account_id']),null,array(),60*60*24*5);
		//error_log(__METHOD__.' ('.__LINE__.') '.array2string($this->icServer->acc_folder_trash));
		//error_log(__METHOD__.' ('.__LINE__.') '.array2string($this->icServer->acc_folder_sent));
		//error_log(__METHOD__.' ('.__LINE__.') '.array2string($this->icServer->acc_folder_draft));
		//error_log(__METHOD__.' ('.__LINE__.') '.array2string($this->icServer->acc_folder_template));
		self::$specialUseFolders = $_specialUseFolders[$this->icServer->ImapServerId] ?? [];
		if (isset($_specialUseFolders[$this->icServer->ImapServerId]) && !empty($_specialUseFolders[$this->icServer->ImapServerId]))
			return $_specialUseFolders[$this->icServer->ImapServerId];
		$_specialUseFolders[$this->icServer->ImapServerId]=array();
		//if (!empty($this->icServer->acc_folder_trash) && !isset($_specialUseFolders[$this->icServer->ImapServerId][$this->icServer->acc_folder_trash]))
			$_specialUseFolders[$this->icServer->ImapServerId][$this->icServer->acc_folder_trash]='Trash';
		//if (!empty($this->icServer->acc_folder_draft) && !isset($_specialUseFolders[$this->icServer->ImapServerId][$this->icServer->acc_folder_draft]))
			$_specialUseFolders[$this->icServer->ImapServerId][$this->icServer->acc_folder_draft]='Drafts';
		//if (!empty($this->icServer->acc_folder_sent) && !isset($_specialUseFolders[$this->icServer->ImapServerId][$this->icServer->acc_folder_sent]))
			$_specialUseFolders[$this->icServer->ImapServerId][$this->icServer->acc_folder_sent]='Sent';
		//if (!empty($this->icServer->acc_folder_template) && !isset($_specialUseFolders[$this->icServer->ImapServerId][$this->icServer->acc_folder_template]))
			$_specialUseFolders[$this->icServer->ImapServerId][$this->icServer->acc_folder_template]='Templates';
		$_specialUseFolders[$this->icServer->ImapServerId][$this->icServer->acc_folder_junk]='Junk';
		$_specialUseFolders[$this->icServer->ImapServerId][$this->icServer->acc_folder_archive]='Archive';
		//error_log(__METHOD__.' ('.__LINE__.') '.array2string($_specialUseFolders));//.'<->'.array2string($this->icServer));
		self::$specialUseFolders = $_specialUseFolders[$this->icServer->ImapServerId];
		Cache::setCache(Cache::INSTANCE,'email','specialUseFolders'.trim($GLOBALS['egw_info']['user']['account_id']),$_specialUseFolders, 60*60*24*5);
		return $_specialUseFolders[$this->icServer->ImapServerId];
	}

	/**
	 * get IMAP folder status regarding NoSelect
	 *
	 * @param foldertoselect string the foldername
	 *
	 * @return boolean true or false regarding the noselect attribute
	 */
	function folderIsSelectable($folderToSelect)
	{
		$retval = true;
		if($folderToSelect && ($folderStatus = $this->getFolderStatus($folderToSelect,false,true))) {
			if (!empty($folderStatus['attributes']) && stripos(array2string($folderStatus['attributes']),'noselect')!==false)
			{
				$retval = false;
			}
		}
		return $retval;
	}

	/**
	 * get IMAP folder status, wrapper to store results within a single request
	 *
	 * returns an array information about the imap folder
	 *
	 * @param folderName string the foldername
	 * @param ignoreStatusCache bool ignore the cache used for counters
	 *
	 * @return array
	 *
	 * @throws Exception
	 */
	function _getStatus($folderName,$ignoreStatusCache=false)
	{
		static $folderStatus = null;
		if (!$ignoreStatusCache && isset($folderStatus[$this->icServer->ImapServerId][$folderName]))
		{
			//error_log(__METHOD__.' ('.__LINE__.') '.' Using cache for status on Server:'.$this->icServer->ImapServerId.' for folder:'.$folderName.'->'.array2string($folderStatus[$this->icServer->ImapServerId][$folderName]));
			return $folderStatus[$this->icServer->ImapServerId][$folderName];
		}
		try
		{
			$folderStatus[$this->icServer->ImapServerId][$folderName] = $this->icServer->getStatus($folderName,$ignoreStatusCache);
		}
		catch (\Exception $e)
		{
			throw new Exception(__METHOD__.' ('.__LINE__.') '." failed for $folderName with error:".$e->getMessage().($e->details?', '.$e->details:''));
		}
		return $folderStatus[$this->icServer->ImapServerId][$folderName];
	}

	/**
	 * get IMAP folder status
	 *
	 * returns an array information about the imap folder, may be used as  wrapper to retrieve results from cache
	 *
	 * @param _folderName string the foldername
	 * @param ignoreStatusCache bool ignore the cache used for counters
	 * @param basicInfoOnly bool retrieve only names and stuff returned by getMailboxes
	 * @param fetchSubscribedInfo bool fetch Subscribed Info on folder
	 * @return array|false
	 */
	function getFolderStatus($_folderName,$ignoreStatusCache=false,$basicInfoOnly=false,$fetchSubscribedInfo=true)
	{
		if (self::$debug) error_log(__METHOD__.' ('.__LINE__.') '." called with:$_folderName,$ignoreStatusCache,$basicInfoOnly");
		if (!is_string($_folderName) || empty($_folderName)||(isset(self::$profileDefunct[$this->profileID]) && strlen(self::$profileDefunct[$this->profileID])))
		{
			// something is wrong. Do not proceed. either no folder or profile is marked as defunct for this request
			return false;
		}
		static $folderInfoCache = null; // reduce traffic on single request
		static $folderBasicInfo = null;
		if (isset($folderBasicInfo[$this->profileID]))
		{
			$folderInfoCache = $folderBasicInfo[$this->profileID];
		}
		if (isset($folderInfoCache[$_folderName]) && $ignoreStatusCache==false && $basicInfoOnly) return $folderInfoCache[$_folderName];
		$retValue = array();

		//error_log(__METHOD__.' ('.__LINE__.') '.$_folderName.' '.array2string(array_keys($folderInfoCache)));
		// does the folder exist???
		if (!isset($folderInfoCache) || !isset($folderInfoCache[$_folderName]))
		{
			try
			{
				$ret = $this->icServer->getMailboxes($_folderName, 1, true);
			}
			catch (\Exception $e)
			{
				//error_log(__METHOD__.array2string($e));
				//error_log(__METHOD__." failed to fetch Mailbox $_folderName on ".$this->profileID.' Reason:'.$e->getMessage().($e->details?', '.$e->details:'')/*.function_backtrace()*/);
				self::$profileDefunct[$this->profileID]=$e->getMessage().($e->details?', '.$e->details:'');
				Cache::setCache(Cache::INSTANCE,'email','profileDefunct'.trim($GLOBALS['egw_info']['user']['account_id']),self::$profileDefunct, $expiration=5*1);
				throw new Exception(__METHOD__." failed to fetch Mailbox $_folderName on ".$this->profileID.' Reason:'.$e->getMessage().($e->details?', '.$e->details:''));
			}
			//error_log(__METHOD__.' ('.__LINE__.') '.$_folderName.' '.array2string($ret));
			if (is_array($ret))
			{
				$retkeys = array_keys($ret);
				if ($retkeys[0]==$_folderName) $folderInfoCache[$_folderName] = $ret[$retkeys[0]];
			}
			else
			{
				$folderInfoCache[$_folderName]=false;
			}
		}
		$folderInfo = $folderInfoCache[$_folderName];
		//error_log(__METHOD__.' ('.__LINE__.') '.array2string($folderInfo).'->'.function_backtrace());
		if($ignoreStatusCache||!$folderInfo|| !is_array($folderInfo)) {
			try
			{
				$folderInfo = $this->_getStatus($_folderName,$ignoreStatusCache);
			}
			catch (\Exception $e)
			{
				//error_log(__METHOD__.array2string($e));
				error_log(__METHOD__." failed to fetch status for $_folderName on ".$this->profileID.' Reason:'.$e->getMessage().($e->details?', '.$e->details:'')/*.function_backtrace()*/);
				self::$profileDefunct[$this->profileID]=$e->getMessage().($e->details?', '.$e->details:'');
				Cache::setCache(Cache::INSTANCE,'email','profileDefunct'.trim($GLOBALS['egw_info']['user']['account_id']),self::$profileDefunct, $expiration=5*1);
				//throw new Exception(__METHOD__." failed to fetch status for $_folderName on ".$this->profileID.' Reason:'.$e->getMessage().($e->details?', '.$e->details:''));
				$folderInfo=null;
			}
			if (!is_array($folderInfo))
			{
				return false;
			}
		}
		#if(!is_array($folderInfo)) {
		#	return false;
		#}
		$retValue['delimiter']		= (isset($folderInfo['HIERACHY_DELIMITER']) && $folderInfo['HIERACHY_DELIMITER']?$folderInfo['HIERACHY_DELIMITER']:$folderInfo['delimiter']);
		$retValue['attributes']		= (isset($folderInfo['ATTRIBUTES']) && $folderInfo['ATTRIBUTES']?$folderInfo['ATTRIBUTES']:$folderInfo['attributes']);
		$retValue['subscribed']     = $folderInfo['SUBSCRIBED'] ?? $folderInfo['subscribed'] ?? false;
		$shortNameParts			= explode($retValue['delimiter'], $_folderName);
		$retValue['shortName']		= array_pop($shortNameParts);
		$retValue['displayName']	= $_folderName;
		$retValue['shortDisplayName']	= $retValue['shortName'];
		if(strtoupper($retValue['shortName']) == 'INBOX') {
			$retValue['displayName']	= lang('INBOX');
			$retValue['shortDisplayName']	= lang('INBOX');
		}
		// translate the automatic Folders (Sent, Drafts, ...) like the INBOX
		elseif (in_array($retValue['shortName'],self::$autoFolders))
		{
			$retValue['displayName'] = $retValue['shortDisplayName'] = lang($retValue['shortName']);
		}
		if ($folderInfo) $folderBasicInfo[$this->profileID][$_folderName]=$retValue;
		//error_log(__METHOD__.' ('.__LINE__.') '.' '.$_folderName.array2string($retValue['attributes']));
		if ($basicInfoOnly || (isset($retValue['attributes']) && stripos(array2string($retValue['attributes']),'noselect')!==false))
		{
			return $retValue;
		}
		// fetch all in one go for one request, instead of querying them one by one
		// cache it for a minute 60*60*1
		// this should reduce communication to the imap server
		static $subscribedFolders = null;
		static $nameSpace = null;
		static $prefix = null;
		if (!isset($nameSpace) || empty($nameSpace[$this->profileID])) $nameSpace[$this->profileID] = $this->_getNameSpaces();
		if (!empty($nameSpace[$this->profileID]))
		{
			$nsNoPersonal=array();
			foreach($nameSpace[$this->profileID] as &$ns)
			{
				if ($ns['type']!='personal') $nsNoPersonal[]=$ns;
			}
			$nameSpace[$this->profileID]=$nsNoPersonal;
		}
		if (!isset($prefix) || empty($prefix[$this->profileID]) || empty($prefix[$this->profileID][$_folderName])) $prefix[$this->profileID][$_folderName] = $this->getFolderPrefixFromNamespace($nameSpace[$this->profileID], $_folderName);

		if ($fetchSubscribedInfo && !isset($subscribedFolders) || empty($subscribedFolders[$this->profileID]))
		{
			$subscribedFolders[$this->profileID] = $this->icServer->listSubscribedMailboxes();
		}

		if($fetchSubscribedInfo && is_array($subscribedFolders[$this->profileID]) && in_array($_folderName,$subscribedFolders[$this->profileID])) {
			$retValue['subscribed'] = true;
		}

		try
		{
			//$folderStatus = $this->_getStatus($_folderName,$ignoreStatusCache);
			$folderStatus = $this->getMailBoxCounters($_folderName,false);
			$retValue['messages']		= $folderStatus['MESSAGES'];
			$retValue['recent']		= $folderStatus['RECENT'];
			$retValue['uidnext']		= $folderStatus['UIDNEXT'];
			$retValue['uidvalidity']	= $folderStatus['UIDVALIDITY'];
			$retValue['unseen']		= $folderStatus['UNSEEN'];
			if (//$retValue['unseen']==0 &&
				(isset($this->mailPreferences['trustServersUnseenInfo']) && // some servers dont serve the UNSEEN information
				$this->mailPreferences['trustServersUnseenInfo']==false) ||
				(isset($this->mailPreferences['trustServersUnseenInfo']) &&
				$this->mailPreferences['trustServersUnseenInfo']==2 &&
				$prefix[$this->profileID][$_folderName] != '' && stripos($_folderName,$prefix[$this->profileID][$_folderName]) !== false)
			)
			{
				//error_log(__METHOD__." returned folderStatus for Folder $_folderName:".print_r($prefix,true).' TS:'.$this->mailPreferences['trustServersUnseenInfo']);
				// we filter for the combined status of unseen and undeleted, as this is what we show in list
				try
				{
					$byUid=true;
					$_reverse=1;
					$sortResult = $this->getSortedList($_folderName, $_sort=0, $_reverse, array('status'=>array('UNSEEN','UNDELETED')),$byUid,false);
					$retValue['unseen'] = $sortResult['count'];
				}
				catch (\Exception $ee)
				{
					if (self::$debug) error_log(__METHOD__." could not fetch/calculate unseen counter for $_folderName Reason:'".$ee->getMessage()."' but requested.");
				}
			}
		}
		catch (\Exception $e)
		{
			if (self::$debug) error_log(__METHOD__." returned folderStatus for Folder $_folderName:".print_r($e->getMessage(),true));
		}

		return $retValue;
	}

	/**
	 * Convert Horde_Mime_Headers object to an associative array like Horde_Mime_Array::toArray()
	 *
	 * Catches Horde_Idna_Exception and returns raw header instead eg. for invalid domains like "test@-domain.com".
	 *
	 * @param Horde_Mime_Headers $headers
	 * @return array
	 */
	protected static function headers2array(Horde_Mime_Headers $headers)
	{
		try {
			$arr = $headers->toArray();
		}
		catch(\Horde_Idna_Exception $e) {
			$arr = array();
			foreach($headers as $header)
			{
				try {
					$val = $header->sendEncode();
				} catch (\Horde_Idna_Exception $e) {
					$val = (array)$header->value;
				}
				$arr[$header->name] = count($val) == 1 ? reset($val) : $val;
			}
		}
		return $arr;
	}

	/**
	 * getHeaders
	 *
	 * this function is a wrapper function for getSortedList and populates the resultList thereof with headerdata
	 *
	 * @param string $_folderName
	 * @param int $_startMessage
	 * @param int $_numberOfMessages number of messages to return
	 * @param array $_sort sort by criteria
	 * @param boolean $_reverse reverse sorting of the result array (may be switched, as it is passed to getSortedList by reference)
	 * @param array $_filter filter to apply to getSortedList
	 * @param mixed $_thisUIDOnly = null, if given fetch the headers of this uid only (either one, or array of uids)
	 * @param boolean $_cacheResult = true try touse the cache of getSortedList
	 * @param mixed $_fetchPreviews = false (boolean/int) fetch part of the body of the messages requested (if integer the number is assumed to be the number of chars to be returned for preview; if set to true 300 chars are returned (when available))
	 * @return array result as array(header=>array,total=>int,first=>int,last=>int)
	 */
	function getHeaders($_folderName, $_startMessage, $_numberOfMessages, $_sort, $_reverse, $_filter, $_thisUIDOnly=null, $_cacheResult=true, $_fetchPreviews=false)
	{
		//self::$debug=true;
		if (self::$debug) error_log(__METHOD__.' ('.__LINE__.') '.function_backtrace());
		if (self::$debug) error_log(__METHOD__.' ('.__LINE__.') '."$_folderName,$_startMessage, $_numberOfMessages, $_sort, $_reverse, ".array2string($_filter).", $_thisUIDOnly");
		$reverse = (bool)$_reverse;
		// get the list of messages to fetch
		$this->reopen($_folderName);
		//$currentFolder = $this->icServer->getCurrentMailbox();
		//if ($currentFolder != $_folderName); $this->icServer->openMailbox($_folderName);
		$rByUid = true; // try searching by uid. this var will be passed by reference to getSortedList, and may be set to false, if UID retrieval fails
		#print "<pre>";
		#$this->icServer->setDebug(true);
		$total=0;
		if ($_thisUIDOnly === null)
		{
			if (($_startMessage || $_numberOfMessages) && !isset($_filter['range']))
			{
				// this will not work we must calculate the range we want to retieve as e.g.: 0:20 retirieves the first 20 mails and sorts them
				// if sort capability is applied to the range fetched, not sort first and fetch the range afterwards
				//$start = $_startMessage-1;
				//$end = $_startMessage-1+$_numberOfMessages;
				//$_filter['range'] ="$start:$end";
				//$_filter['range'] ="$_startMessage:*";
			}
			if (self::$debug) error_log(__METHOD__.' ('.__LINE__.') '."$_folderName, $_sort, $reverse, ".array2string($_filter).", $rByUid");
			if (self::$debug||self::$debugTimes) $starttime = microtime (true);
			//see this example below for a 12 week datefilter (since)
			//$_filter = array('status'=>array('UNDELETED'),'type'=>"SINCE",'string'=> date("d-M-Y", $starttime-(3600*24*7*12)));
			$_sortResult = $this->getSortedList($_folderName, $_sort, $reverse, $_filter, $rByUid, $_cacheResult);
			$sortResult = $_sortResult['match']->ids;
			//$modseq = $_sortResult['modseq'];
			//error_log(__METHOD__.' ('.__LINE__.') '.'Modsequence:'.$modseq);
			if (self::$debug||self::$debugTimes) self::logRunTimes($starttime,null,' call getSortedList for Folder:'.$_folderName.' Filter:'.array2string($_filter).' Ids:'.array2string($_thisUIDOnly),__METHOD__.' ('.__LINE__.') ');

			if (self::$debug) error_log(__METHOD__.' ('.__LINE__.') '.array2string($sortResult));
			#$this->icServer->setDebug(false);
			#print "</pre>";
			// nothing found
			if(!is_array($sortResult) || empty($sortResult)) {
				$retValue = array();
				$retValue['info']['total']	= 0;
				$retValue['info']['first']	= 0;
				$retValue['info']['last']	= 0;
				return $retValue;
			}

			$total = $_sortResult['count'];
			#_debug_array($sortResult);
			#_debug_array(array_slice($sortResult, -5, -2));
			//error_log("REVERSE: $reverse");
			if($reverse === true) {
				if  ($_startMessage<=$total)
				{
					$startMessage = $_startMessage-1;
				}
				else
				{
					//error_log(__METHOD__.' ('.__LINE__.') '.' Start:'.$_startMessage.' NumberOfMessages:'.$_numberOfMessages.' Total:'.$total);
					if ($_startMessage+$_numberOfMessages>$total)
					{
						$numberOfMessages = $total%$_numberOfMessages;
						//$numberOfMessages = abs($_startMessage-$total-1);
						if ($numberOfMessages>0 && $numberOfMessages<=$_numberOfMessages) $_numberOfMessages = $numberOfMessages;
						//error_log(__METHOD__.' ('.__LINE__.') '.' Start:'.$_startMessage.' NumberOfMessages:'.$_numberOfMessages.' Total:'.$total);
					}
					$startMessage=($total-$_numberOfMessages)-1;
					//$retValue['info']['first'] = $startMessage;
					//$retValue['info']['last'] = $total;

				}
				if ($startMessage+$_numberOfMessages>$total)
				{
					$_numberOfMessages = $_numberOfMessages-($total-($startMessage+$_numberOfMessages));
					//$retValue['info']['first'] = $startMessage;
					//$retValue['info']['last'] = $total;
				}
				if($startMessage > 0) {
					if (self::$debug) error_log(__METHOD__.' ('.__LINE__.') '.' StartMessage:'.(-($_numberOfMessages+$startMessage)).', '.-$startMessage.' Number of Messages:'.count($sortResult));
					$sortResult = array_slice($sortResult, -($_numberOfMessages+$startMessage), -$startMessage);
				} else {
					if (self::$debug) error_log(__METHOD__.' ('.__LINE__.') '.' StartMessage:'.(-($_numberOfMessages+($_startMessage-1))).', AllTheRest, Number of Messages:'.count($sortResult));
					$sortResult = array_slice($sortResult, -($_numberOfMessages+($_startMessage-1)));
				}
				$sortResult = array_reverse($sortResult);
			} else {
				if (self::$debug) error_log(__METHOD__.' ('.__LINE__.') '.' StartMessage:'.($_startMessage-1).', '.$_numberOfMessages.' Number of Messages:'.count($sortResult));
				$sortResult = array_slice($sortResult, $_startMessage-1, $_numberOfMessages);
			}
			if (self::$debug) error_log(__METHOD__.' ('.__LINE__.') '.array2string($sortResult));
		}
		else
		{
			$sortResult = (is_array($_thisUIDOnly) ? $_thisUIDOnly:(array)$_thisUIDOnly);
		}


		// fetch the data for the selected messages
		if (self::$debug||self::$debugTimes) $starttime = microtime(true);
		try
		{
			$uidsToFetch = new Horde_Imap_Client_Ids();
			$uidsToFetch->add($sortResult);

			$fquery = new Horde_Imap_Client_Fetch_Query();

			// Pre-cache the headers we want, 'fetchHeaders' is a label into the cache
			$fquery->headers('fetchHeaders',array(
				'DISPOSITION-NOTIFICATION-TO','RETURN-RECEIPT-TO','X-CONFIRM-READING-TO',
				'DATE','SUBJECT','FROM','TO','CC','REPLY-TO',
				'X-PRIORITY'
			),array(
				// Cache headers, we'll look at them below
				'cache' => true,//$_cacheResult,
				// Set peek so messages are not flagged as read
				'peek' => true
			));
			$fquery->size();
			$fquery->structure();
			$fquery->flags();
			$fquery->imapDate();// needed to ensure getImapDate fetches the internaldate, not the current time
			// if $_fetchPreviews is activated fetch part of the messages too
			if ($_fetchPreviews) $fquery->fullText(array('peek'=>true,'length'=>((int)$_fetchPreviews<5000?5000:$_fetchPreviews),'start'=>0));
			$headersNew = $this->icServer->fetch($_folderName, $fquery, array(
				'ids' => $uidsToFetch,
			));
			//error_log(__METHOD__.' ('.__LINE__.') '.array2string($headersNew->ids()));
		}
		catch (\Exception $e)
		{
			$headersNew = array();
			$sortResult = array();
		}
		if (self::$debug||self::$debugTimes)
		{
			self::logRunTimes($starttime,null,'HordeFetch: for Folder:'.$_folderName.' Filter:'.array2string($_filter),__METHOD__.' ('.__LINE__.') ');
			if (self::$debug)
			{
				$queryString = implode(',', $sortResult);
				error_log(__METHOD__.' ('.__LINE__.') '.' Query:'.$queryString.' Result:'.array2string($headersNew));
			}
		}

		$cnt = 0;

		foreach((array)$sortResult as $uid) {
			$sortOrder[$uid] = $cnt++;
		}

		$count = 0;
		if (is_object($headersNew)) {
			if (self::$debug||self::$debugTimes) $starttime = microtime(true);
			foreach($headersNew->ids() as $id) {
				$_headerObject = $headersNew->get($id);
				//error_log(__METHOD__.' ('.__LINE__.') '.array2string($_headerObject));
				$headerObject = array();
				$bodyPreview = null;
				$uid = $headerObject['UID']= ($_headerObject->getUid()?$_headerObject->getUid():$id);
				$headerObject['MSG_NUM'] = $_headerObject->getSeq();
				$headerObject['SIZE'] = $_headerObject->getSize();
				$headerObject['INTERNALDATE'] = $_headerObject->getImapDate();

					// Get already cached headers, 'fetchHeaders' is a label matchimg above
				$headerForPrio = self::headers2array($_headerObject->getHeaders('fetchHeaders',Horde_Imap_Client_Data_Fetch::HEADER_PARSE));
				// Try to fetch header with key='' as some servers might have no fetchHeaders index. e.g. yandex.com
				if (empty($headerForPrio)) $headerForPrio = self::headers2array($_headerObject->getHeaders('',Horde_Imap_Client_Data_Fetch::HEADER_PARSE));
				//fetch the fullMsg part if all conditions match to be available in case $_headerObject->getHeaders returns
				//nothing worthwhile (as it does for googlemail accounts, when preview is switched on
				if ($_fetchPreviews)
				{
					// on enabled preview $bodyPreview is needed lateron. fetched here, for fallback-reasons
					// in case of failed Header-Retrieval
					$bodyPreview = $_headerObject->getFullMsg();
					if (empty($headerForPrio)||(is_array($headerForPrio)&&count($headerForPrio)===1&&$headerForPrio['']))
					{
						$length = strpos($bodyPreview, Horde_Mime_Part::RFC_EOL.Horde_Mime_Part::RFC_EOL);
						if ($length===false) $length = strlen($bodyPreview);
						$headerForPrio = self::headers2array(Horde_Mime_Headers::parseHeaders(substr($bodyPreview, 0,$length)));
					}
				}
				$headerForPrio = array_change_key_case($headerForPrio, CASE_UPPER);
				if (self::$debug) {
					error_log(__METHOD__.' ('.__LINE__.') '.array2string($_headerObject).'UID:'.$_headerObject->getUid().' Size:'.$_headerObject->getSize().' Date:'.$_headerObject->getImapDate().'/'.DateTime::to($_headerObject->getImapDate(),'Y-m-d H:i:s'));
					error_log(__METHOD__.' ('.__LINE__.') '.array2string($headerForPrio));
				}
				// message deleted from server but cache still reporting its existence ; may happen on QRESYNC with No permanent modsequences
				if (empty($headerForPrio))
				{
					$total--;
					continue;
				}
				if ( isset($headerForPrio['DISPOSITION-NOTIFICATION-TO']) ) {
					$headerObject['DISPOSITION-NOTIFICATION-TO'] = self::decode_header(trim($headerForPrio['DISPOSITION-NOTIFICATION-TO']));
				} else if ( isset($headerForPrio['RETURN-RECEIPT-TO']) ) {
					$headerObject['DISPOSITION-NOTIFICATION-TO'] = self::decode_header(trim($headerForPrio['RETURN-RECEIPT-TO']));
				} else if ( isset($headerForPrio['X-CONFIRM-READING-TO']) ) {
					$headerObject['DISPOSITION-NOTIFICATION-TO'] = self::decode_header(trim($headerForPrio['X-CONFIRM-READING-TO']));
				} /*else $sent_not = "";*/
				//error_log(__METHOD__.' ('.__LINE__.') '.array2string($headerObject));
				$headerObject['DATE'] = $headerForPrio['DATE'];
				$headerObject['SUBJECT'] = (is_array($headerForPrio['SUBJECT'])?$headerForPrio['SUBJECT'][0]:$headerForPrio['SUBJECT']);
				$headerObject['FROM'] = (array)($headerForPrio['FROM']?$headerForPrio['FROM']:($headerForPrio['REPLY-TO']?$headerForPrio['REPLY-TO']:$headerForPrio['RETURN-PATH']));
				$headerObject['TO'] = (array)$headerForPrio['TO'];
				$headerObject['CC'] = isset($headerForPrio['CC'])?(array)$headerForPrio['CC']:array();
				$headerObject['REPLY-TO'] = isset($headerForPrio['REPLY-TO'])?(array)$headerForPrio['REPLY-TO']:array();
				$headerObject['PRIORITY'] = isset($headerForPrio['X-PRIORITY'])?$headerForPrio['X-PRIORITY']:null;
				foreach (array('FROM','TO','CC','REPLY-TO') as $key)
				{
					$address = array();
					foreach ($headerObject[$key] as $k => $ad)
					{
						//the commented section below IS a simplified version of the section "make sure ..."
						/*
						if (stripos($ad,'@')===false)
						{
							$remember=$k;
						}
						else
						{
							$address[] = (isset($remember)?$headerObject[$key][$remember].' ':'').$ad;
							$remember=null;
						}
						*/
						// make sure addresses are real emailaddresses one by one in the array as expected
						$rfcAddr = self::parseAddressList($ad); // does some fixing of known problems too
						foreach ($rfcAddr as $_rfcAddr)
						{
							if (!$_rfcAddr->valid)	continue; // skip. not a valid address
							$address[] = imap_rfc822_write_address($_rfcAddr->mailbox,$_rfcAddr->host,$_rfcAddr->personal);
						}
					}
					$headerObject[$key] = $address;
				}
				$headerObject['FLAGS'] = $_headerObject->getFlags();
				$headerObject['BODYPREVIEW']=null;
				// this section fetches part of the message-body (if enabled) for some kind of preview
				// if we fail to succeed, we fall back to the retrieval of the message-body with
				// fetchPartContents (see below, when we iterate over the structure to determine the
				// existance (and the details) for attachments)
				if ($_fetchPreviews)
				{
					// $bodyPreview is populated at the beginning of the loop, as it may be
					// needed to parse the Headers of the Message
					if (empty($bodyPreview)) $bodyPreview = $_headerObject->getFullMsg();
					//error_log(__METHOD__.' ('.__LINE__.') '.array2string($bodyPreview));
					$base = Horde_Mime_Part::parseMessage($bodyPreview);
					foreach($base->partIterator() as $part)
					{
						//error_log(__METHOD__.__LINE__.'Part:'.$part->getPrimaryType());
						if (empty($headerObject['BODYPREVIEW'])&&$part->getPrimaryType()== 'text')
						{
							$charset = $part->getContentTypeParameter('charset');
							$buffer = Mail\Html::convertHTMLToText($part->toString(array(
												'encode' => Horde_Mime_Part::ENCODE_BINARY,	// otherwise we cant recode charset
											)), $charset, 'utf-8');
							$headerObject['BODYPREVIEW']=trim(str_replace(array("\r\n","\r","\n"),' ',mb_substr(Translation::convert_jsonsafe($buffer),0,((int)$_fetchPreviews<300?300:$_fetchPreviews))));
						} elseif (empty($headerObject['BODYPREVIEW'])&&$part->getPrimaryType()== 'multipart')
						{
							//error_log(__METHOD__.' ('.__LINE__.') '.array2string($part));
						}
					}
					//error_log(__METHOD__.' ('.__LINE__.') '.array2string($headerObject['BODYPREVIEW']));
				}
				$mailStructureObject = $_headerObject->getStructure();
				//error_log(__METHOD__.' ('.__LINE__.') '.array2string($headerObject));
				//error_log(__METHOD__.' ('.__LINE__.') '.' MimeMap:'.array2string($mailStructureObject->contentTypeMap()));
				//foreach ($_headerObject->getStructure()->getParts() as $p => $part)
				$headerObject['ATTACHMENTS']=null;
				$skipParts=array();
				$messageMimeType='';
				foreach ($mailStructureObject->contentTypeMap() as $mime_id => $mime_type)
				{
					if ($mime_id==0 || $messageMimeType==='') $messageMimeType = $mime_type;
					$part = $mailStructureObject->getPart($mime_id);
					$partdisposition = $part->getDisposition();
					$partPrimaryType = $part->getPrimaryType();
					// this section fetches the body for the purpose of previewing a few lines
					// drawback here it is talking to the mailserver for each mail thus consuming
					// more time than expected; so we call this section only when there is no
					// bodypreview could be found (multipart/....)
					if ($_fetchPreviews && empty($headerObject['BODYPREVIEW'])&&($partPrimaryType == 'text') &&
						((intval($mime_id) === 1) || !$mime_id) &&
						($partdisposition !== 'attachment')) {
							$_structure=$part;
							$this->fetchPartContents($uid, $_structure, false,true);
							$headerObject['BODYPREVIEW']=trim(str_replace(array("\r\n","\r","\n"),' ',mb_substr(Mail\Html::convertHTMLToText($_structure->getContents()),0,((int)$_fetchPreviews<300?300:$_fetchPreviews))));
							$charSet = $part->getCharset();
							// check if client set a wrong charset and content is utf-8 --> use utf-8
							if (strtolower($charSet) !='utf-8' && preg_match('//u', $headerObject['BODYPREVIEW']))
							{
								$charSet = 'UTF-8';
							}
							// add line breaks to $bodyParts
							//error_log(__METHOD__.' ('.__LINE__.') '.' Charset:'.$bodyParts[$i]['charSet'].'->'.$bodyParts[$i]['body']);
							$headerObject['BODYPREVIEW']  = Translation::convert_jsonsafe($headerObject['BODYPREVIEW'], $charSet);
							//error_log(__METHOD__.__LINE__.$headerObject['BODYPREVIEW']);
					}
					//error_log(__METHOD__.' ('.__LINE__.') '.' Uid:'.$uid.'->'.$mime_id.' Disp:'.$partdisposition.' Type:'.$partPrimaryType);
					$cid = $part->getContentId();
					if (empty($partdisposition) && $partPrimaryType != 'multipart' && $partPrimaryType != 'text')
					{
						// the presence of an cid does not necessarily indicate its inline. it may lack the needed
						// link to show the image. Considering this: we "list" everything that matches the above criteria
						// as attachment in order to not loose/miss information on our data
						$partdisposition='attachment';//($partPrimaryType == 'image'&&!empty($cid)?'inline':'attachment');
					}
					if ($mime_type=='message/rfc822')
					{
						//error_log(__METHOD__.' ('.__LINE__.') '.' Uid:'.$uid.'->'.$mime_id.':'.array2string($part->contentTypeMap()));
						foreach($part->contentTypeMap() as $sub_id => $sub_type) { if ($sub_id != $mime_id) $skipParts[$sub_id] = $sub_type;}
					}
					//error_log(__METHOD__.' ('.__LINE__.') '.' Uid:'.$uid.'->'.$mime_id.' Disp:'.$partdisposition.' Type:'.$partPrimaryType.' Skip:'.array2string($skipParts));
					if (array_key_exists($mime_id,$skipParts)) continue;
					if ($partdisposition=='attachment' ||
						($partdisposition=='inline'&&$partPrimaryType == 'image'&&$mime_type=='image/tiff') || // as we are not able to display tiffs
						($partdisposition=='inline'&&$partPrimaryType == 'image'&&empty($cid)) ||
						($partdisposition=='inline' && $partPrimaryType != 'image' && $partPrimaryType != 'multipart' && $partPrimaryType != 'text'))
					{
						$headerObject['ATTACHMENTS'][$mime_id]=$part->getAllDispositionParameters();
						$headerObject['ATTACHMENTS'][$mime_id]['mimeType']=$mime_type;
						$headerObject['ATTACHMENTS'][$mime_id]['uid']=$uid;
						$headerObject['ATTACHMENTS'][$mime_id]['cid'] = $cid;
						$headerObject['ATTACHMENTS'][$mime_id]['partID']=$mime_id;
						if (!isset($headerObject['ATTACHMENTS'][$mime_id]['name']))
						{
							$headerObject['ATTACHMENTS'][$mime_id]['name']= $part->getName() ? $part->getName() :
								($mime_type == "message/rfc822" ? lang('forwarded message') : lang('attachment'));
						}
						if (!strcasecmp($headerObject['ATTACHMENTS'][$mime_id]['name'],'winmail.dat') ||
							$headerObject['ATTACHMENTS'][$mime_id]['mimeType']=='application/ms-tnef')
						{
							$headerObject['ATTACHMENTS'][$mime_id]['is_winmail'] = true;
						}
						//error_log(__METHOD__.' ('.__LINE__.') '.' PartDisposition:'.$mime_id.'->'.array2string($part->getName()));
						//error_log(__METHOD__.' ('.__LINE__.') '.' PartDisposition:'.$mime_id.'->'.array2string($part->getAllDispositionParameters()));
						//error_log(__METHOD__.' ('.__LINE__.') '.' Attachment:'.$mime_id.'->'.array2string($headerObject['ATTACHMENTS'][$mime_id]));
					}
				}
				//error_log(__METHOD__.' ('.__LINE__.') '.' FindBody (plain):'.array2string($mailStructureObject->findBody('plain')));
				//error_log(__METHOD__.' ('.__LINE__.') '.' FindBody (html):'.array2string($mailStructureObject->findBody('html')));
				//if($count == 0) error_log(__METHOD__.array2string($headerObject));
				if (empty($headerObject['UID'])) continue;
				//$uid = ($rByUid ? $headerObject['UID'] : $headerObject['MSG_NUM']);
				// make dates like "Mon, 23 Apr 2007 10:11:06 UT" working with strtotime
				if(substr($headerObject['DATE'],-2) === 'UT') {
					$headerObject['DATE'] .= 'C';
				}
				if(substr($headerObject['INTERNALDATE'],-2) === 'UT') {
					$headerObject['INTERNALDATE'] .= 'C';
				}
				//error_log(__METHOD__.' ('.__LINE__.') '.' '.$headerObject['SUBJECT'].'->'.$headerObject['DATE'].'<->'.$headerObject['INTERNALDATE'] .'#');
				//error_log(__METHOD__.' ('.__LINE__.') '.' '.$this->decode_subject($headerObject['SUBJECT']).'->'.$headerObject['DATE']);
				if (isset($headerObject['ATTACHMENTS']) && count($headerObject['ATTACHMENTS'])) foreach ($headerObject['ATTACHMENTS'] as &$a) { $retValue['header'][$sortOrder[$uid]]['attachments'][]=$a;}
				$retValue['header'][$sortOrder[$uid]]['subject']	= $this->decode_subject($headerObject['SUBJECT']);
				$retValue['header'][$sortOrder[$uid]]['size'] 		= $headerObject['SIZE'];
				$retValue['header'][$sortOrder[$uid]]['date']		= self::_strtotime(($headerObject['DATE']&&!($headerObject['DATE']=='NIL')?$headerObject['DATE']:$headerObject['INTERNALDATE']),'ts',true);
				$retValue['header'][$sortOrder[$uid]]['internaldate']= self::_strtotime($headerObject['INTERNALDATE'],'ts',true);
				$retValue['header'][$sortOrder[$uid]]['mimetype']	= $messageMimeType;
				$retValue['header'][$sortOrder[$uid]]['id']		= $headerObject['MSG_NUM'];
				$retValue['header'][$sortOrder[$uid]]['uid']		= $headerObject['UID'];
				$retValue['header'][$sortOrder[$uid]]['bodypreview']		= $headerObject['BODYPREVIEW'];
				$retValue['header'][$sortOrder[$uid]]['priority']		= ($headerObject['PRIORITY']?$headerObject['PRIORITY']:3);
				$retValue['header'][$sortOrder[$uid]]['smimeType']		= Mail\Smime::getSmimeType($mailStructureObject);
				//error_log(__METHOD__.' ('.__LINE__.') '.' '.array2string($retValue['header'][$sortOrder[$uid]]));
				if (isset($headerObject['DISPOSITION-NOTIFICATION-TO'])) $retValue['header'][$sortOrder[$uid]]['disposition-notification-to'] = $headerObject['DISPOSITION-NOTIFICATION-TO'];
				if (!empty($headerObject['FLAGS'])) {
					$retValue['header'][$sortOrder[$uid]] = array_merge($retValue['header'][$sortOrder[$uid]],self::prepareFlagsArray($headerObject));
				}
				//error_log(__METHOD__.' ('.__LINE__.') '.$headerObject['SUBJECT'].'->'.array2string($_headerObject->getEnvelope()->__get('from')));
				if(!empty($headerObject['FROM'][0])) {
					$retValue['header'][$sortOrder[$uid]]['sender_address'] = self::decode_header($headerObject['FROM'][0],true);
					if (count($headerObject['FROM'])>1)
					{
						$ki=0;
						foreach($headerObject['FROM'] as $k => $add)
						{
							if ($k==0) continue;
							$retValue['header'][$sortOrder[$uid]]['additional_from_addresses'][$ki] = self::decode_header($add,true);
							$ki++;
						}
					}
				}
				if(!empty($headerObject['REPLY-TO'][0])) {
					$retValue['header'][$sortOrder[$uid]]['reply_to_address'] = self::decode_header($headerObject['REPLY-TO'][0],true);
				}
				if(!empty($headerObject['TO'][0])) {
					$retValue['header'][$sortOrder[$uid]]['to_address'] = self::decode_header($headerObject['TO'][0],true);
					if (count($headerObject['TO'])>1)
					{
						$ki=0;
						foreach($headerObject['TO'] as $k => $add)
						{
							if ($k==0) continue;
							//error_log(__METHOD__.' ('.__LINE__.') '."-> $k:".array2string($add));
							$retValue['header'][$sortOrder[$uid]]['additional_to_addresses'][$ki] = self::decode_header($add,true);
							//error_log(__METHOD__.' ('.__LINE__.') '.array2string($retValue['header'][$sortOrder[$uid]]['additional_to_addresses'][$ki]));
							$ki++;
						}
					}
				}
				if(!empty($headerObject['CC'])) {
					$ki=0;
					foreach($headerObject['CC'] as $k => $add)
					{
						//error_log(__METHOD__.' ('.__LINE__.') '."-> $k:".array2string($add));
						$retValue['header'][$sortOrder[$uid]]['cc_addresses'][$ki] = self::decode_header($add,true);
						//error_log(__METHOD__.' ('.__LINE__.') '.array2string($retValue['header'][$sortOrder[$uid]]['additional_to_addresses'][$ki]));
						$ki++;
					}
				}
				//error_log(__METHOD__.' ('.__LINE__.') '.array2string($retValue['header'][$sortOrder[$uid]]));

				$count++;
			}
			if (self::$debug||self::$debugTimes) self::logRunTimes($starttime,null,' fetching Headers and stuff for Folder:'.$_folderName,__METHOD__.' ('.__LINE__.') ');
			//self::$debug=false;
			// sort the messages to the requested displayorder
			if(is_array($retValue['header'])) {
				$countMessages = $total;
				if (isset($_filter['range'])) $countMessages = self::$folderStatusCache[$this->profileID][$_folderName]['messages'];
				ksort($retValue['header']);
				$retValue['info']['total']	= $total;
				//if ($_startMessage>$total) $_startMessage = $total-($count-1);
				$retValue['info']['first']	= $_startMessage;
				$retValue['info']['last']	= $_startMessage + $count - 1 ;
				return $retValue;
			} else {
				$retValue = array();
				$retValue['info']['total']	= 0;
				$retValue['info']['first']	= 0;
				$retValue['info']['last']	= 0;
				return $retValue;
			}
		} else {
			if ($headersNew == null && empty($_thisUIDOnly)) error_log(__METHOD__." -> retrieval of Message Details to Query $queryString failed: ".print_r($headersNew,TRUE));
			$retValue = array();
			$retValue['info']['total']  = 0;
			$retValue['info']['first']  = 0;
			$retValue['info']['last']   = 0;
			return $retValue;
		}
	}

	/**
	 * static function prepareFlagsArray
	 * prepare headerObject to return some standardized array to tell which flags are set for a message
	 * @param array $headerObject  - array to process, a full return array from icServer->getSummary
	 * @return array array of flags
	 */
	static function prepareFlagsArray($headerObject)
	{
		if (is_array($headerObject['FLAGS'])) $headerFlags = array_map('strtolower',$headerObject['FLAGS']);
		$retValue = array();
		$retValue['recent']		= in_array('\\recent', $headerFlags);
		$retValue['flagged']	= in_array('\\flagged', $headerFlags);
		$retValue['answered']	= in_array('\\answered', $headerFlags);
		$retValue['forwarded']   = in_array('$forwarded', $headerFlags);
		$retValue['deleted']	= in_array('\\deleted', $headerFlags);
		$retValue['seen']		= in_array('\\seen', $headerFlags);
		$retValue['draft']		= in_array('\\draft', $headerFlags);
		$retValue['mdnsent']	= in_array('$mdnsent', $headerFlags)||in_array('mdnsent', $headerFlags);
		$retValue['mdnnotsent']	= in_array('$mdnnotsent', $headerFlags)||in_array('mdnnotsent', $headerFlags);
		$retValue['label1']   = in_array('$label1', $headerFlags);
		$retValue['label2']   = in_array('$label2', $headerFlags);
		$retValue['label3']   = in_array('$label3', $headerFlags);
		$retValue['label4']   = in_array('$label4', $headerFlags);
		$retValue['label5']   = in_array('$label5', $headerFlags);
		//error_log(__METHOD__.' ('.__LINE__.') '.$headerObject['SUBJECT'].':'.array2string($retValue));
		return $retValue;
	}

	/**
	 * fetches a sorted list of messages from the imap server
	 * private function
	 *
	 * @todo implement sort based on Net_IMAP
	 * @param string $_folderName the name of the folder in which the messages get searched
	 * @param integer $_sort the primary sort key
	 * @param bool $_reverse sort the messages ascending or descending
	 * @param array $_filter the search filter
	 * @param bool $resultByUid if set to true, the result is to be returned by uid, if the server does not reply
	 * 			on a query for uids, the result may be returned by IDs only, this will be indicated by this param
	 * @param bool $setSession if set to true the session will be populated with the result of the query
	 * @return mixed bool/array false or array of ids
	 */
	function getSortedList($_folderName, $_sort, &$_reverse, $_filter, &$resultByUid=true, $setSession=true)
	{
		static $cachedFolderStatus = null;
		// in the past we needed examineMailbox to figure out if the server with the serverID support keywords
		// this information is filled/provided by examineMailbox; but caching within one request seems o.k.
		if (!isset($cachedFolderStatus) || !isset($cachedFolderStatus[$this->profileID][$_folderName]) )
		{
			$folderStatus = $cachedFolderStatus[$this->profileID][$_folderName] = $this->icServer->examineMailbox($_folderName);
		}
		else
		{
			$folderStatus = $cachedFolderStatus[$this->profileID][$_folderName];
		}
		//error_log(__METHOD__.' ('.__LINE__.') '.' F:'.$_folderName.' S:'.array2string($folderStatus));
		//error_log(__METHOD__.' ('.__LINE__.') '.' Filter:'.array2string($_filter));
		$try2useCache = true;
		static $eMailListContainsDeletedMessages = null;
		if (!isset($eMailListContainsDeletedMessages)) $eMailListContainsDeletedMessages = Cache::getCache(Cache::INSTANCE,'email','eMailListContainsDeletedMessages'.trim($GLOBALS['egw_info']['user']['account_id']),null,array(),60*60*1)??[];
		// this indicates, that there is no Filter set, and the returned set/subset should not contain DELETED Messages, nor filtered for UNDELETED
		if ($setSession==true && ((strpos(array2string($_filter), 'UNDELETED') === false && strpos(array2string($_filter), 'DELETED') === false)))
		{
			if (self::$debugTimes) $starttime = microtime(true);
			if (!isset($eMailListContainsDeletedMessages) || empty($eMailListContainsDeletedMessages[$this->profileID]) || empty($eMailListContainsDeletedMessages[$this->profileID][$_folderName])) $eMailListContainsDeletedMessages = Cache::getCache(Cache::INSTANCE,'email','eMailListContainsDeletedMessages'.trim($GLOBALS['egw_info']['user']['account_id']),null,array(),60*60*1);
			$five=true;
			$dReverse=1;
			$deletedMessages = $this->getSortedList($_folderName, 0, $dReverse, array('status'=>array('DELETED')),$five,false);
			if (self::$debug) error_log(__METHOD__.' ('.__LINE__.') Found DeletedMessages:'.array2string($eMailListContainsDeletedMessages));
			$eMailListContainsDeletedMessages[$this->profileID][$_folderName] =$deletedMessages['count'];
			Cache::setCache(Cache::INSTANCE,'email','eMailListContainsDeletedMessages'.trim($GLOBALS['egw_info']['user']['account_id']),$eMailListContainsDeletedMessages, 60*60*1);
			if (self::$debugTimes) self::logRunTimes($starttime,null,'setting eMailListContainsDeletedMessages for Profile:'.$this->profileID.' Folder:'.$_folderName.' to '.$eMailListContainsDeletedMessages[$this->profileID][$_folderName],__METHOD__.' ('.__LINE__.') ');			//error_log(__METHOD__.' ('.__LINE__.') '.' Profile:'.$this->profileID.' Folder:'.$_folderName.' -> EXISTS/SessStat:'.array2string($folderStatus['MESSAGES']).'/'.self::$folderStatusCache[$this->profileID][$_folderName]['messages'].' ListContDelMsg/SessDeleted:'.$eMailListContainsDeletedMessages[$this->profileID][$_folderName].'/'.self::$folderStatusCache[$this->profileID][$_folderName]['deleted']);
		}
		$try2useCache = false;
		//self::$supportsORinQuery[$this->profileID]=true;
		if (!isset(self::$supportsORinQuery) || !isset(self::$supportsORinQuery[$this->profileID]))
		{
			self::$supportsORinQuery = Cache::getCache(Cache::INSTANCE,'email','supportsORinQuery'.trim($GLOBALS['egw_info']['user']['account_id']),null,array(),60*60*10);
			if (!isset(self::$supportsORinQuery[$this->profileID])) self::$supportsORinQuery[$this->profileID]=true;
		}
		//error_log(__METHOD__.' ('.__LINE__.') '.array2string($_filter).' SupportsOrInQuery:'.self::$supportsORinQuery[$this->profileID]);
		$filter = $this->createIMAPFilter($_folderName, $_filter,self::$supportsORinQuery[$this->profileID]);
		if (self::$debug)
		{
			$query_str = $filter->build();
			error_log(__METHOD__.' ('.__LINE__.') '.' '.$query_str['query']);
		}
		//_debug_array($filter);
		//error_log(__METHOD__.' ('.__LINE__.') '.array2string($filter).'#'.array2string($this->icServer->capability()));
		if($this->icServer->hasCapability('SORT')) {
			// when using an orQuery and we sort by date. sort seems to fail on certain servers => ZIMBRA with Horde_Imap_Client
			// thus we translate the search request from date to Horde_Imap_Client::SORT_SEQUENCE (which should be the same, if
			// there is no messing with the dates)
			//if (self::$supportsORinQuery[$this->profileID]&&$_sort=='date'&&$_filter['type']=='quick'&&!empty($_filter['string']))$_sort='INTERNALDATE';
			if (self::$debug) error_log(__METHOD__." Mailserver has SORT Capability, SortBy: ".array2string($_sort)." Reverse: $_reverse");
			$sortOrder = $this->_getSortString($_sort, $_reverse);
			if ($_reverse && in_array(Horde_Imap_Client::SORT_REVERSE,$sortOrder)) $_reverse=false; // as we reversed the result already
			if (self::$debug) error_log(__METHOD__." Mailserver runs SORT: SortBy:".array2string($_sort)."->".array2string($sortOrder)." Filter: ".array2string($filter));
			try
			{
				$sortResult = $this->icServer->search($_folderName, $filter, array(
					'sort' => $sortOrder,));

				// Attempt another search without sorting filter if first try failed with
				// no result, as may some servers do not coupe well with sort option
				// eventhough they claim to support SORT capability.
				if (!isset($sortResult['count'])) $sortResult = $this->icServer->search($_folderName, $filter);

			// if there is an Error, we assume that the server is not capable of sorting
			}
			catch(\Exception $e)
			{
				//error_log(__METHOD__.'('.__LINE__.'):'.$e->getMessage());
				$resultByUid = false;
				$sortOrder = array(Horde_Imap_Client::SORT_SEQUENCE);
				if ($_reverse) array_unshift($sortOrder,Horde_Imap_Client::SORT_REVERSE);
				try
				{
					$sortResult = $this->icServer->search($_folderName, $filter, array(
						'sort' => $sortOrder));
				}
				catch(\Exception $e)
				{
					error_log(__METHOD__.'('.__LINE__.'):'.$e->getMessage());
					$sortResult = self::$folderStatusCache[$this->profileID][$_folderName]['sortResult'];
				}
			}
			if (self::$debug) error_log(__METHOD__.print_r($sortResult,true));
		} else {
			if (self::$debug) error_log(__METHOD__." Mailserver has NO SORT Capability");
			//$sortOrder = array(Horde_Imap_Client::SORT_SEQUENCE);
			//if ($_reverse) array_unshift($sortOrder,Horde_Imap_Client::SORT_REVERSE);
			try
			{
				$sortResult = $this->icServer->search($_folderName, $filter, array()/*array(
					'sort' => $sortOrder)*/);
			}
			catch(\Exception $e)
			{
				//error_log(__METHOD__.'('.__LINE__.'):'.$e->getMessage());
				// possible error OR Query. But Horde gives no detailed Info :-(
				self::$supportsORinQuery[$this->profileID]=false;
				Cache::setCache(Cache::INSTANCE,'email','supportsORinQuery'.trim($GLOBALS['egw_info']['user']['account_id']),self::$supportsORinQuery,60*60*10);
				if (self::$debug) error_log(__METHOD__.__LINE__." Mailserver seems to have NO OR Capability for Search");
				$filter = $this->createIMAPFilter($_folderName, $_filter, self::$supportsORinQuery[$this->profileID]);
				try
				{
					$sortResult = $this->icServer->search($_folderName, $filter, array()/*array(
						'sort' => $sortOrder)*/);
				}
				catch(\Exception $e)
				{
				}
			}
			if(is_array($sortResult['match'])) {
					// not sure that this is going so succeed as $sortResult['match'] is a hordeObject
					sort($sortResult['match'], SORT_NUMERIC);
			}
			if (self::$debug) error_log(__METHOD__." using Filter:".print_r($filter,true)." ->".print_r($sortResult,true));
		}
		if ($setSession)
		{
			self::$folderStatusCache[$this->profileID][$_folderName]['uidValidity'] = $folderStatus['UIDVALIDITY'];
			self::$folderStatusCache[$this->profileID][$_folderName]['messages']	= $folderStatus['MESSAGES'];
			self::$folderStatusCache[$this->profileID][$_folderName]['deleted']	= $eMailListContainsDeletedMessages[$this->profileID][$_folderName] ?? [];
			self::$folderStatusCache[$this->profileID][$_folderName]['uidnext']	= $folderStatus['UIDNEXT'];
			self::$folderStatusCache[$this->profileID][$_folderName]['filter']	= $_filter;
			self::$folderStatusCache[$this->profileID][$_folderName]['sortResult'] = $sortResult;
			self::$folderStatusCache[$this->profileID][$_folderName]['sort']	= $_sort;
		}
		//error_log(__METHOD__." using Filter:".print_r($filter,true)." ->".print_r($sortResult,true));
		//_debug_array($sortResult['match']->ids);
		return $sortResult;
	}

	/**
	 * convert the sort value from the gui(integer) into a string
	 *
	 * @param mixed _sort the integer sort order / or a valid and handeled SORTSTRING (right now: UID/ARRIVAL/INTERNALDATE (->ARRIVAL))
	 * @param bool _reverse wether to add REVERSE to the Sort String or not
	 * @return the sort sequence for horde search
	 */
	function _getSortString($_sort, $_reverse=false)
	{
		$_reverse=false;
		if (is_numeric($_sort))
		{
			switch($_sort) {
				case 2:
					$retValue = array(Horde_Imap_Client::SORT_FROM);
					break;
				case 4:
					$retValue = array(Horde_Imap_Client::SORT_TO);
					break;
				case 3:
					$retValue = array(Horde_Imap_Client::SORT_SUBJECT);
					break;
				case 6:
					$retValue = array(Horde_Imap_Client::SORT_SIZE);
					break;
				case 0:
				default:
					$retValue = array(Horde_Imap_Client::SORT_DATE);
					//$retValue = 'ARRIVAL';
					break;
			}
		}
		else
		{
			switch(strtoupper($_sort)) {
				case 'FROMADDRESS':
					$retValue = array(Horde_Imap_Client::SORT_FROM);
					break;
				case 'TOADDRESS':
					$retValue = array(Horde_Imap_Client::SORT_TO);
					break;
				case 'SUBJECT':
					$retValue = array(Horde_Imap_Client::SORT_SUBJECT);
					break;
				case 'SIZE':
					$retValue = array(Horde_Imap_Client::SORT_SIZE);
					break;
				case 'ARRIVAL':
					$retValue = array(Horde_Imap_Client::SORT_ARRIVAL);
					break;
				case 'UID': // should be equivalent to INTERNALDATE, which is ARRIVAL, which should be highest (latest) uid should be newest date
				case 'INTERNALDATE':
					$retValue = array(Horde_Imap_Client::SORT_SEQUENCE);
					break;
				case 'DATE':
				default:
					$retValue = array(Horde_Imap_Client::SORT_DATE);
					break;
			}
		}
		if ($_reverse) array_unshift($retValue,Horde_Imap_Client::SORT_REVERSE);
		//error_log(__METHOD__.' ('.__LINE__.') '.' '.($_reverse?'REVERSE ':'').$_sort.'->'.$retValue);
		return $retValue;
	}

	/**
	 * this function creates an IMAP filter from the criterias given
	 *
	 * @param string $_folder used to determine the search to TO or FROM on QUICK Search wether it is a send-folder or not
	 * @param array $_criterias contains the search/filter criteria
	 * @param boolean $_supportsOrInQuery wether to use the OR Query on QuickSearch
	 * @return Horde_Imap_Client_Search_Query the IMAP filter
	 */
	function createIMAPFilter($_folder, $_criterias, $_supportsOrInQuery=true)
	{
		$imapFilter = new Horde_Imap_Client_Search_Query();
		$imapFilter->charset('UTF-8');

		//_debug_array($_criterias);
		if (self::$debug) error_log(__METHOD__.' ('.__LINE__.') '.' Criterias:'.(!is_array($_criterias)?" none -> returning":array2string($_criterias)));
		if((!is_array($_criterias) || $_criterias['status']=='any') &&
			(!isset($_criterias['string']) || empty($_criterias['string'])) &&
			(!isset($_criterias['range'])|| empty($_criterias['range']) ||
			( !empty($_criterias['range'])&& ($_criterias['range']!='BETWEEN' && empty($_criterias['date'])||
			($_criterias['range']=='BETWEEN' && empty($_criterias['since'])&& empty($_criterias['before']))))))
		{
			//error_log(__METHOD__.' ('.__LINE__.') returning early Criterias:'.print_r($_criterias, true));
			$imapFilter->flag('DELETED', $set=false);
			return $imapFilter;
		}
		$queryValid = false;
		// statusQuery MUST be placed first, as search for subject/mailbody and such is
		// depending on charset. flagSearch is not BUT messes the charset if called afterwards
		$statusQueryValid = false;
		foreach((array)$_criterias['status'] as $k => $criteria) {
			$imapStatusFilter = new Horde_Imap_Client_Search_Query();
			$imapStatusFilter->charset('UTF-8');
			$criteria = strtoupper($criteria);
			switch ($criteria) {
				case 'ANSWERED':
				case 'DELETED':
				case 'FLAGGED':
				case 'RECENT':
				case 'SEEN':
					$imapStatusFilter->flag($criteria, $set=true);
					$queryValid = $statusQueryValid =true;
					break;
				case 'READ':
					$imapStatusFilter->flag('SEEN', $set=true);
					$queryValid = $statusQueryValid =true;
					break;
				case 'LABEL1':
				case 'KEYWORD1':
				case 'LABEL2':
				case 'KEYWORD2':
				case 'LABEL3':
				case 'KEYWORD3':
				case 'LABEL4':
				case 'KEYWORD4':
				case 'LABEL5':
				case 'KEYWORD5':
					$imapStatusFilter->flag(str_ireplace('KEYWORD','$LABEL',$criteria), $set=true);
					$queryValid = $statusQueryValid =true;
					break;
				case 'NEW':
					$imapStatusFilter->flag('RECENT', $set=true);
					$imapStatusFilter->flag('SEEN', $set=false);
					$queryValid = $statusQueryValid =true;
					break;
				case 'OLD':
					$imapStatusFilter->flag('RECENT', $set=false);
					$queryValid = $statusQueryValid =true;
					break;
// operate only on system flags
//        $systemflags = array(
//            'ANSWERED', 'DELETED', 'DRAFT', 'FLAGGED', 'RECENT', 'SEEN'
//        );
				case 'UNANSWERED':
					$imapStatusFilter->flag('ANSWERED', $set=false);
					$queryValid = $statusQueryValid =true;
					break;
				case 'UNDELETED':
					$imapFilter->flag('DELETED', $set=false);
					$queryValid = true;
					break;
				case 'UNFLAGGED':
					$imapStatusFilter->flag('FLAGGED', $set=false);
					$queryValid = $statusQueryValid =true;
					break;
				case 'UNREAD':
				case 'UNSEEN':
					$imapStatusFilter->flag('SEEN', $set=false);
					$queryValid = $statusQueryValid =true;
					break;
				case 'UNLABEL1':
				case 'UNKEYWORD1':
				case 'UNLABEL2':
				case 'UNKEYWORD2':
				case 'UNLABEL3':
				case 'UNKEYWORD3':
				case 'UNLABEL4':
				case 'UNKEYWORD4':
				case 'UNLABEL5':
				case 'UNKEYWORD5':
					$imapStatusFilter->flag(str_ireplace(array('UNKEYWORD','UNLABEL'),'$LABEL',$criteria), $set=false);
					$queryValid = $statusQueryValid =true;
					break;
				default:
					$statusQueryValid = false;
			}
			if ($statusQueryValid)
			{
				$imapFilter->andSearch($imapStatusFilter);
			}
		}


		//error_log(__METHOD__.' ('.__LINE__.') '.print_r($_criterias, true));
		$imapSearchFilter = new Horde_Imap_Client_Search_Query();
		$imapSearchFilter->charset('UTF-8');

		if(!empty($_criterias['string'])) {
			$criteria = strtoupper($_criterias['type']);
			switch ($criteria) {
				case 'BYDATE':
				case 'QUICK':
				case 'QUICKWITHCC':
					$imapSearchFilter->headerText('SUBJECT', $_criterias['string'], $not=false);
					//$imapSearchFilter->charset('UTF-8');
					$imapFilter2 = new Horde_Imap_Client_Search_Query();
					$imapFilter2->charset('UTF-8');
					if($this->isSentFolder($_folder)) {
						$imapFilter2->headerText('TO', $_criterias['string'], $not=false);
					} else {
						$imapFilter2->headerText('FROM', $_criterias['string'], $not=false);
					}
					if ($_supportsOrInQuery)
					{
						$imapSearchFilter->orSearch($imapFilter2);
					}
					else
					{
						$imapSearchFilter->andSearch($imapFilter2);
					}
					if ($_supportsOrInQuery && $criteria=='QUICKWITHCC')
					{
						$imapFilter3 = new Horde_Imap_Client_Search_Query();
						$imapFilter3->charset('UTF-8');
						$imapFilter3->headerText('CC', $_criterias['string'], $not=false);
						$imapSearchFilter->orSearch($imapFilter3);
					}
					$queryValid = true;
					break;
				case 'LARGER':
				case 'SMALLER':
					if (strlen(trim($_criterias['string'])) != strlen((float) trim($_criterias['string'])))
					{
						//examine string to evaluate size
						$unit = strtoupper(trim(substr(trim($_criterias['string']),strlen((float) trim($_criterias['string'])))));
						$multipleBy = array('KB'=>1024,'K'=>1024,
											'MB'=>1024*1000,'M'=>1024*1000,
											'GB'=>1024*1000*1000,'G'=>1024*1000*1000,
											'TB'=>1024*1000*1000*1000,'T'=>1024*1000*1000*1000);
						$numberinBytes=(float)$_criterias['string'];
						if (isset($multipleBy[$unit])) $numberinBytes=(float)$_criterias['string']*$multipleBy[$unit];
						//error_log(__METHOD__.__LINE__.'#'.$_criterias['string'].'->'.(float)$_criterias['string'].'#'.$unit.' ='.$numberinBytes);
						$_criterias['string']=$numberinBytes;
					}
					$imapSearchFilter->size( $_criterias['string'], ($criteria=='LARGER'?true:false), $not=false);
					//$imapSearchFilter->charset('UTF-8');
					$queryValid = true;
					break;
				case 'FROM':
				case 'TO':
				case 'CC':
				case 'BCC':
				case 'SUBJECT':
					$imapSearchFilter->headerText($criteria, $_criterias['string'], $not=false);
					//$imapSearchFilter->charset('UTF-8');
					$queryValid = true;
					break;
				case 'BODY':
				case 'TEXT':
					$imapSearchFilter->text($_criterias['string'],($criteria=='BODY'?true:false), $not=false);
					//$imapSearchFilter->charset('UTF-8');
					$queryValid = true;
					break;
				case 'SINCE':
					$imapSearchFilter->dateSearch(new DateTime($_criterias['string']), Horde_Imap_Client_Search_Query::DATE_SINCE, $header=true, $not=false);
					$queryValid = true;
					break;
				case 'BEFORE':
					$imapSearchFilter->dateSearch(new DateTime($_criterias['string']), Horde_Imap_Client_Search_Query::DATE_BEFORE, $header=true, $not=false);
					$queryValid = true;
					break;
				case 'ON':
					$imapSearchFilter->dateSearch(new DateTime($_criterias['string']), Horde_Imap_Client_Search_Query::DATE_ON, $header=true, $not=false);
					$queryValid = true;
					break;
			}
		}
		if ($statusQueryValid && !$queryValid) $queryValid=true;
		if ($queryValid) $imapFilter->andSearch($imapSearchFilter);

		if (isset($_criterias['range']) && !empty($_criterias['range']))
		{
			$rangeValid = false;
			$imapRangeFilter = new Horde_Imap_Client_Search_Query();
			$imapRangeFilter->charset('UTF-8');
			$criteria = strtoupper($_criterias['range']);
			if ($_criterias['range'] == "BETWEEN" && isset($_criterias['since']) && isset($_criterias['before']) && $_criterias['since']==$_criterias['before'])
			{
				$_criterias['date']=$_criterias['since'];
				unset($_criterias['since']);
				unset($_criterias['before']);
				$criteria=$_criterias['range']='ON';
			}
			switch ($criteria) {
				case 'BETWEEN':
					//try to be smart about missing
					//enddate
					if ($_criterias['since'])
					{
						$imapRangeFilter->dateSearch(new DateTime($_criterias['since']), Horde_Imap_Client_Search_Query::DATE_SINCE, $header=true, $not=false);
						$rangeValid = true;
					}
					//startdate
					if ($_criterias['before'])
					{
						$imapRangeFilter2 = new Horde_Imap_Client_Search_Query();
						$imapRangeFilter2->charset('UTF-8');
						//our before (startdate) is inklusive, as we work with "d-M-Y", we must add a day
						$_criterias['before'] = date("d-M-Y",DateTime::to($_criterias['before'],'ts')+(3600*24));
						$imapRangeFilter2->dateSearch(new DateTime($_criterias['before']), Horde_Imap_Client_Search_Query::DATE_BEFORE, $header=true, $not=false);
						$imapRangeFilter->andSearch($imapRangeFilter2);
						$rangeValid = true;
					}
					break;
				case 'SINCE'://enddate
					$imapRangeFilter->dateSearch(new DateTime(($_criterias['since']??$_criterias['date'])), Horde_Imap_Client_Search_Query::DATE_SINCE, $header=true, $not=false);
					$rangeValid = true;
					break;
				case 'BEFORE'://startdate
					//our before (startdate) is inklusive, as we work with "d-M-Y", we must add a day
					$_criterias['before'] = date("d-M-Y",DateTime::to(($_criterias['before']??$_criterias['date']),'ts')+(3600*24));
					$imapRangeFilter->dateSearch(new DateTime($_criterias['before']), Horde_Imap_Client_Search_Query::DATE_BEFORE, $header=true, $not=false);
					$rangeValid = true;
					break;
				case 'ON':
					$imapRangeFilter->dateSearch(new DateTime($_criterias['date']), Horde_Imap_Client_Search_Query::DATE_ON, $header=true, $not=false);
					$rangeValid = true;
					break;
			}
			if ($rangeValid && !$queryValid) $queryValid=true;
			if ($rangeValid) $imapFilter->andSearch($imapRangeFilter);
		}
		if (self::$debug)
		{
			//$imapFilter->charset('UTF-8');
			$query_str = $imapFilter->build();
			//error_log(__METHOD__.' ('.__LINE__.') '.' '.$query_str['query'].' created by Criterias:'.(!is_array($_criterias)?" none -> returning":array2string($_criterias)));
		}
		if($queryValid==false) {
			$imapFilter->flag('DELETED', $set=false);
			return $imapFilter;
		} else {
			return $imapFilter;
		}
	}

	/**
	 * decode header (or envelope information)
	 * if array given, note that only values will be converted
	 * @param  mixed $_string input to be converted, if array call decode_header recursively on each value
	 * @param  boolean|string $_tryIDNConversion (true/false AND 'FORCE'): try IDN Conversion on domainparts of emailADRESSES
	 * @return mixed - based on the input type
	 */
	static function decode_header($_string, $_tryIDNConversion=false)
	{
		if (is_array($_string))
		{
			foreach($_string as $k=>$v)
			{
				$_string[$k] = self::decode_header($v, $_tryIDNConversion);
			}
			return $_string;
		}
		else
		{
			$_string = Mail\Html::decodeMailHeader($_string,self::$displayCharset);
			$test = @json_encode($_string);
			//error_log(__METHOD__.__LINE__.' ->'.strlen($singleBodyPart['body']).' Error:'.json_last_error().'<- BodyPart:#'.$test.'#');
			if (($test=="null" || $test === false || !isset($test)) && strlen($_string)>0)
			{
				// try to fix broken utf8
				$x = utf8_encode($_string);
				$test = @json_encode($x);
				if (($test=="null" || $test === false || !isset($test)) && strlen($_string)>0)
				{
					// this should not be needed, unless something fails with charset detection/ wrong charset passed
					$_string = (function_exists('mb_convert_encoding')?mb_convert_encoding($_string,'UTF-8','UTF-8'):(function_exists('iconv')?@iconv("UTF-8","UTF-8//IGNORE",$_string):$_string));
				}
				else
				{
					$_string = $x;
				}
			}

			if ($_tryIDNConversion===true && stripos($_string,'@')!==false)
			{
				$rfcAddr = self::parseAddressList($_string);
				$stringA = array();
				foreach ($rfcAddr as $_rfcAddr)
				{
					if (!$_rfcAddr->valid)
					{
						$stringA = array();
						break; // skip idna conversion if we encounter an error here
					}
					try {
						$stringA[] = imap_rfc822_write_address($_rfcAddr->mailbox,Horde_Idna::decode($_rfcAddr->host),$_rfcAddr->personal);
					}
					// if Idna conversation fails, leave address unchanged
					catch(\Exception $e) {
						unset($e);
						$stringA[] = imap_rfc822_write_address($_rfcAddr->mailbox, $_rfcAddr->host, $_rfcAddr->personal);
					}
				}
				if (!empty($stringA)) $_string = implode(',',$stringA);
			}
			if ($_tryIDNConversion==='FORCE')
			{
				//error_log(__METHOD__.' ('.__LINE__.') '.'->'.$_string.'='.Horde_Idna::decode($_string));
				$_string = Horde_Idna::decode($_string);
			}
			return $_string;
		}
	}

	/**
	 * decode subject
	 * if array given, note that only values will be converted
	 * @param  mixed $_string input to be converted, if array call decode_header recursively on each value
	 * @param  boolean $decode try decoding
	 * @return mixed - based on the input type
	 */
	function decode_subject($_string,$decode=true)
	{
		#$string = $_string;
		if($_string=='NIL')
		{
			return 'No Subject';
		}
		if ($decode) $_string = self::decode_header($_string);
		// make sure its utf-8
		$test = @json_encode($_string);
		if (($test=="null" || $test === false || !isset($test)) && strlen($_string)>0)
		{
			$_string = utf8_encode($_string);
		}
		return $_string;

	}

	/**
	 * decodeEntityFolderName - remove html entities
	 * @param string _folderName the foldername
	 * @return string the converted string
	 */
	function decodeEntityFolderName($_folderName)
	{
		return html_entity_decode($_folderName, ENT_QUOTES, self::$displayCharset);
	}

	/**
	 * convert a mailboxname from utf7-imap to displaycharset
	 *
	 * @param string _folderName the foldername
	 * @return string the converted string
	 */
	function encodeFolderName($_folderName)
	{
		return Translation::convert($_folderName, 'UTF7-IMAP', self::$displayCharset);
	}

	/**
	 * convert the foldername from display charset to UTF-7
	 *
	 * @param string _parent the parent foldername
	 * @return ISO-8859-1 / UTF7-IMAP encoded string
	 */
	function _encodeFolderName($_folderName) {
		return Translation::convert($_folderName, self::$displayCharset, 'ISO-8859-1');
		#return Translation::convert($_folderName, self::$displayCharset, 'UTF7-IMAP');
	}

	/**
	 * create a new folder under given parent folder
	 *
	 * @param string _parent the parent foldername
	 * @param string _folderName the new foldername
	 * @param string _error pass possible error back to caller
	 *
	 * @return mixed name of the newly created folder or false on error
	 */
	function createFolder($_parent, $_folderName, &$_error)
	{
		if (self::$debug) error_log(__METHOD__.' ('.__LINE__.') '."->"."$_parent, $_folderName called from:".function_backtrace());
		$parent		= $_parent;//$this->_encodeFolderName($_parent);
		$folderName	= $_folderName;//$this->_encodeFolderName($_folderName);

		if(empty($parent)) {
			$newFolderName = $folderName;
		} else {
			$HierarchyDelimiter = $this->getHierarchyDelimiter();
			$newFolderName = $parent . $HierarchyDelimiter . $folderName;
		}
		if (empty($newFolderName)) return false;
		if (self::$debug) error_log(__METHOD__.' ('.__LINE__.') '.'->'.$newFolderName);
		if ($this->folderExists($newFolderName,true))
		{
			if (self::$debug) error_log(__METHOD__.' ('.__LINE__.') '." Folder $newFolderName already exists.");
			return $newFolderName;
		}
		try
		{
			$opts = array();
			// if new created folder is a specal-use-folder, mark it as such, so other clients know to use it too
			if (isset(self::$specialUseFolders[$newFolderName]))
			{
				$opts['special_use'] = self::$specialUseFolders[$newFolderName];
			}
			$this->icServer->createMailbox($newFolderName, $opts);
		}
		catch (\Exception $e)
		{
			$_error = lang('Could not create Folder %1 Reason: %2',$newFolderName,$e->getMessage());
			error_log(__METHOD__.' ('.__LINE__.') '.' create Folder '.$newFolderName.'->'.$e->getMessage().' ('.$e->details.') Namespace:'.array2string($this->icServer->getNameSpaces()).function_backtrace());
			return false;
		}
		try
		{
			$this->icServer->subscribeMailbox($newFolderName);
		}
		catch (\Exception $e)
		{
			error_log(__METHOD__.' ('.__LINE__.') '.' subscribe to new folder '.$newFolderName.'->'.$e->getMessage().' ('.$e->details);
			return false;
		}

		return $newFolderName;
	}

	/**
	 * rename a folder
	 *
	 * @param string _oldFolderName the old foldername
	 * @param string _parent the parent foldername
	 * @param string _folderName the new foldername
	 *
	 * @return mixed name of the newly created folder or false on error
	 * @throws Exception
	 */
	function renameFolder($_oldFolderName, $_parent, $_folderName)
	{
		$oldFolderName	= $_oldFolderName;//$this->_encodeFolderName($_oldFolderName);
		$parent		= $_parent;//$this->_encodeFolderName($_parent);
		$folderName	= $_folderName;//$this->_encodeFolderName($_folderName);

		if(empty($parent)) {
			$newFolderName = $folderName;
		} else {
			$HierarchyDelimiter = $this->getHierarchyDelimiter();
			$newFolderName = $parent . $HierarchyDelimiter . $folderName;
		}
		if (self::$debug) error_log("create folder: $newFolderName");
		try
		{
			$this->icServer->renameMailbox($oldFolderName, $newFolderName);
		}
		catch (\Exception $e)
		{
			throw new Exception(__METHOD__." failed for $oldFolderName (rename to: $newFolderName) with error:".$e->getMessage());;
		}
		// clear FolderExistsInfoCache
		Cache::setCache(Cache::INSTANCE,'email','icServerFolderExistsInfo'.trim($GLOBALS['egw_info']['user']['account_id']),null,60*60*5);

		return $newFolderName;

	}

	/**
	 * delete an existing folder
	 *
	 * @param string _folderName the name of the folder to be deleted
	 *
	 * @return bool true on success, PEAR Error on failure
	 * @throws Exception
	 */
	function deleteFolder($_folderName)
	{
		//$folderName = $this->_encodeFolderName($_folderName);
		try
		{
			$this->icServer->subscribeMailbox($_folderName,false);
			$this->icServer->deleteMailbox($_folderName);
		}
		catch (\Exception $e)
		{
			throw new Exception("Deleting Folder $_folderName failed! Error:".$e->getMessage());;
		}
		// clear FolderExistsInfoCache
		Cache::setCache(Cache::INSTANCE,'email','icServerFolderExistsInfo'.trim($GLOBALS['egw_info']['user']['account_id']),null,60*60*5);

		return true;
	}

	/**
	 * fetchUnSubscribedFolders: get unsubscribed IMAP folder list
	 *
	 * returns an array of unsubscribed IMAP folder names.
	 *
	 * @return array with folder names. eg.: 1 => INBOX/TEST
	 */
	function fetchUnSubscribedFolders()
	{
		$unSubscribedMailboxes = $this->icServer->listUnSubscribedMailboxes();
		//error_log(__METHOD__.' ('.__LINE__.') '.array2string($unSubscribedMailboxes));
		return $unSubscribedMailboxes;
	}

	/**
	 * get IMAP folder objects
	 *
	 * returns an array of IMAP folder objects. Put INBOX folder in first
	 * position. Preserves the folder seperator for later use. The returned
	 * array is indexed using the foldername. Use cachedObjects when retrieving subscribedFolders
	 *
	 * @param boolean _subscribedOnly  get subscribed or all folders
	 * @param boolean _getCounters   get get messages counters
	 * @param boolean _alwaysGetDefaultFolders  this triggers to ignore the possible notavailableautofolders - preference
	 *			as activeSync needs all folders like sent, trash, drafts, templates and outbox - if not present devices may crash
	 *			-> autoFolders should be created if needed / accessed (if possible and configured)
	 * @param boolean _useCacheIfPossible  - if set to false cache will be ignored and reinitialized
	 *
	 * @return array with folder objects. eg.: INBOX => {inbox object}
	 */
	function getFolderObjects($_subscribedOnly=false, $_getCounters=false, $_alwaysGetDefaultFolders=false,$_useCacheIfPossible=true)
	{
		if (self::$debug) error_log(__METHOD__.' ('.__LINE__.') '.' ServerID:'.$this->icServer->ImapServerId.", subscribedOnly:$_subscribedOnly, getCounters:$_getCounters, alwaysGetDefaultFolders:$_alwaysGetDefaultFolders, _useCacheIfPossible:$_useCacheIfPossible");
		if (self::$debugTimes) $starttime = microtime (true);
		static $folders2return;
		//$_subscribedOnly=false;
		// always use static on single request if info is available;
		// so if you require subscribed/unsubscribed results on a single request you MUST
		// set $_useCacheIfPossible to false !
		if ($_useCacheIfPossible && isset($folders2return[$this->icServer->ImapServerId]) && !empty($folders2return[$this->icServer->ImapServerId]))
		{
			if (self::$debugTimes) self::logRunTimes($starttime,null,'using static',__METHOD__.' ('.__LINE__.') ');
			return $folders2return[$this->icServer->ImapServerId];
		}

		if ($_subscribedOnly && $_getCounters===false)
		{
			if (!isset($folders2return)) $folders2return = Cache::getCache(Cache::INSTANCE,'email','folderObjects'.trim($GLOBALS['egw_info']['user']['account_id']),null,array(),60*60*1);
			if ($_useCacheIfPossible && isset($folders2return[$this->icServer->ImapServerId]) && !empty($folders2return[$this->icServer->ImapServerId]))
			{
				//error_log(__METHOD__.' ('.__LINE__.') '.' using Cached folderObjects'.array2string($folders2return[$this->icServer->ImapServerId]));
				if (self::$debugTimes) self::logRunTimes($starttime,null,'from Cache',__METHOD__.' ('.__LINE__.') ');
				return $folders2return[$this->icServer->ImapServerId];
			}
		}
		// use $folderBasicInfo for holding attributes and other basic folderinfo $folderBasicInfo[$this->icServer->ImapServerId]
		static $folderBasicInfo;
		if (!isset($folderBasicInfo)||!isset($folderBasicInfo[$this->icServer->ImapServerId])) $folderBasicInfo = Cache::getCache(Cache::INSTANCE,'email','folderBasicInfo'.trim($GLOBALS['egw_info']['user']['account_id']),null,array(),60*60*1);
		//error_log(__METHOD__.' ('.__LINE__.') '.array2string(array_keys($folderBasicInfo[$this->icServer->ImapServerId])));

		$delimiter = $this->getHierarchyDelimiter();

		$inboxData = new \stdClass;
		$inboxData->name 		= 'INBOX';
		$inboxData->folderName		= 'INBOX';
		$inboxData->displayName		= lang('INBOX');
		$inboxData->delimiter 		= $delimiter;
		$inboxData->shortFolderName	= 'INBOX';
		$inboxData->shortDisplayName	= lang('INBOX');
		$inboxData->subscribed = true;
		if($_getCounters == true) {
			$inboxData->counter = $this->getMailBoxCounters('INBOX');
		}
		// force unsubscribed by preference showAllFoldersInFolderPane
		if ($_subscribedOnly == true &&
			isset($this->mailPreferences['showAllFoldersInFolderPane']) &&
			$this->mailPreferences['showAllFoldersInFolderPane']==1)
		{
			$_subscribedOnly = false;
		}
		$inboxFolderObject = array('INBOX' => $inboxData);

		//$nameSpace = $this->icServer->getNameSpaces();
		$nameSpace = $this->_getNameSpaces();
		$fetchedAllInOneGo = false;
		$subscribedFoldersForCache = $foldersNameSpace = array();
		//error_log(__METHOD__.__LINE__.array2string($nameSpace));
		if (is_array($nameSpace))
		{
			foreach($nameSpace as $k => $singleNameSpace) {
				$type = $singleNameSpace['type'];
				// the following line (assumption that for the same namespace the delimiter should be equal) may be wrong
				$foldersNameSpace[$type]['delimiter']  = $singleNameSpace['delimiter'];

				if(is_array($singleNameSpace)&&$fetchedAllInOneGo==false) {
					// fetch and sort the subscribed folders
					// we alway fetch the subscribed, as this provides the only way to tell
					// if a folder is subscribed or not
					if ($_subscribedOnly == true)
					{
						try
						{
							$subscribedMailboxes = $this->icServer->listSubscribedMailboxes('',0,true);
							if (!empty($subscribedMailboxes))
							{
								$fetchedAllInOneGo = true;
							}
							else
							{
								$subscribedMailboxes = $this->icServer->listSubscribedMailboxes($singleNameSpace['prefix'],0,true);
							}
						}
						catch(Exception $e)
						{
							continue;
						}
						//echo "subscribedMailboxes";_debug_array($subscribedMailboxes);
						$subscribedFoldersPerNS = (!empty($subscribedMailboxes)?array_keys($subscribedMailboxes):array());
						//if (is_array($foldersNameSpace[$type]['subscribed'])) sort($foldersNameSpace[$type]['subscribed']);
						//_debug_array($foldersNameSpace);
						//error_log(__METHOD__.__LINE__.array2string($singleNameSpace).':#:'.array2string($subscribedFoldersPerNS));
						if (!empty($subscribedFoldersPerNS) && !empty($subscribedMailboxes))
						{
							//error_log(__METHOD__.' ('.__LINE__.') '." $type / subscribed:". array2string($subscribedMailboxes));
							foreach ($subscribedMailboxes as $k => $finfo)
							{
								//error_log(__METHOD__.__LINE__.$k.':#:'.array2string($finfo));
								$subscribedFoldersForCache[$this->icServer->ImapServerId][$k]=
								$folderBasicInfo[$this->icServer->ImapServerId][$k]=array(
									'MAILBOX'=>$finfo['MAILBOX'],
									'ATTRIBUTES'=>$finfo['ATTRIBUTES'],
									'delimiter'=>$finfo['delimiter'],//lowercase for some reason???
									'SUBSCRIBED'=>$finfo['SUBSCRIBED'],//seeded by getMailboxes
								);
								if (empty($foldersNameSpace[$type]['subscribed']) || !in_array($k,$foldersNameSpace[$type]['subscribed']))
								{
									$foldersNameSpace[$type]['subscribed'][] = $k;
								}
								if (empty($foldersNameSpace[$type]['all']) || !in_array($k,$foldersNameSpace[$type]['all']))
								{
									$foldersNameSpace[$type]['all'][] = $k;
								}
							}
						}
						//error_log(__METHOD__.' ('.__LINE__.') '.' '.$type.'->'.array2string($foldersNameSpace[$type]['subscribed']));
						if (!is_array($foldersNameSpace[$type]['all'])) $foldersNameSpace[$type]['all'] = array();
						if ($_subscribedOnly == true && !empty($foldersNameSpace[$type]['subscribed'])) {
							continue;
						}

					}

					// fetch and sort all folders
					//echo $type.'->'.$singleNameSpace['prefix'].'->'.($type=='shared'?0:2)."<br>";
					try
					{
						// calling with 2 lists all mailboxes on that level with fetches all
						// we switch to all, to avoid further calls for subsequent levels
						// that may produce problems, when encountering recursions probably
						// horde is handling that, so we do not; keep that in mind!
						//$allMailboxesExt = $this->icServer->getMailboxes($singleNameSpace['prefix'],2,true);
						$allMailboxesExt = $this->icServer->getMailboxes($singleNameSpace['prefix'],0,true);
					}
					catch (\Exception $e)
					{
						error_log(__METHOD__.' ('.__LINE__.') '.' Failed to retrieve all Boxes:'.$e->getMessage());
						$allMailboxesExt = array();
					}
					if (!is_array($allMailboxesExt))
					{
						//error_log(__METHOD__.' ('.__LINE__.') '.' Expected Array but got:'.array2string($allMailboxesExt). 'Type:'.$type.' Prefix:'.$singleNameSpace['prefix']);
						continue;
						//$allMailboxesExt=array();
					}

					//error_log(__METHOD__.' ('.__LINE__.') '.' '.$type.'->'.array2string($allMailboxesExt));
					foreach ($allMailboxesExt as $mbx) {
						if (!isset($folderBasicInfo[$this->icServer->ImapServerId][$mbx['MAILBOX']]))
						{
							$folderBasicInfo[$this->icServer->ImapServerId][$mbx['MAILBOX']]=array(
								'MAILBOX'=>$mbx['MAILBOX'],
								'ATTRIBUTES'=>$mbx['ATTRIBUTES'],
								'delimiter'=>$mbx['delimiter'],//lowercase for some reason???
								'SUBSCRIBED'=>$mbx['SUBSCRIBED'],//seeded by getMailboxes
							);
							if ($mbx['SUBSCRIBED'] && !isset($subscribedFoldersForCache[$this->icServer->ImapServerId][$mbx['MAILBOX']]))
							{
								$subscribedFoldersForCache[$this->icServer->ImapServerId][$mbx['MAILBOX']] = $folderBasicInfo[$this->icServer->ImapServerId][$mbx['MAILBOX']];
							}
						}
						if ($mbx['SUBSCRIBED'] && (empty($foldersNameSpace[$type]['subscribed']) || !in_array($mbx['MAILBOX'],$foldersNameSpace[$type]['subscribed'])))
						{
							$foldersNameSpace[$type]['subscribed'][] = $mbx['MAILBOX'];
						}
						//echo __METHOD__;_debug_array($mbx);
						//error_log(__METHOD__.' ('.__LINE__.') '.array2string($mbx));
						if (isset($allMailBoxesExtSorted[$mbx['MAILBOX']])||
							isset($allMailBoxesExtSorted[$mbx['MAILBOX'].$foldersNameSpace[$type]['delimiter']])||
							(substr($mbx['MAILBOX'],-1)==$foldersNameSpace[$type]['delimiter'] && isset($allMailBoxesExtSorted[substr($mbx['MAILBOX'],0,-1)]))
						) continue;

						//echo '#'.$mbx['MAILBOX'].':'.array2string($mbx)."#<br>";
						$allMailBoxesExtSorted[$mbx['MAILBOX']] = $mbx;
					}
					if (is_array($allMailBoxesExtSorted)) ksort($allMailBoxesExtSorted);
					//_debug_array(array_keys($allMailBoxesExtSorted));
					$allMailboxes = array();
					foreach ((array)$allMailBoxesExtSorted as $mbx) {
						if (!in_array($mbx['MAILBOX'],$allMailboxes)) $allMailboxes[] = $mbx['MAILBOX'];
						//echo "Result:";_debug_array($allMailboxes);
					}
					$foldersNameSpace[$type]['all'] = $allMailboxes;
					if (is_array($foldersNameSpace[$type]['all'])) sort($foldersNameSpace[$type]['all']);
				}
			}
		}
		//subscribed folders may be used in getFolderStatus
		Cache::setCache(Cache::INSTANCE,'email','subscribedFolders'.trim($GLOBALS['egw_info']['user']['account_id']),$subscribedFoldersForCache,$expiration=60*60*1);
		//echo "<br>FolderNameSpace To Process:";_debug_array($foldersNameSpace);
		$autoFolderObjects = $folders = array();
		$autofolder_exists = array();
		foreach( array('personal', 'others', 'shared') as $type) {
			if(isset($foldersNameSpace[$type])) {
				if($_subscribedOnly) {
					if( !empty($foldersNameSpace[$type]['subscribed']) ) $listOfFolders = $foldersNameSpace[$type]['subscribed'];
				} else {
					if( !empty($foldersNameSpace[$type]['all'])) $listOfFolders = $foldersNameSpace[$type]['all'];
				}
				foreach((array)$listOfFolders as $folderName) {
					//echo "<br>FolderToCheck:$folderName<br>";
					//error_log(__METHOD__.__LINE__.'#Delimiter:'.$delimiter.':#'.$folderName);
					if ($_subscribedOnly && empty($foldersNameSpace[$type]['all'])) continue;//when subscribedonly, we fetch all folders in one go.
					if($_subscribedOnly && !(in_array($folderName, $foldersNameSpace[$type]['all'])||in_array($folderName.$foldersNameSpace[$type]['delimiter'], $foldersNameSpace[$type]['all']))) {
						#echo "$folderName failed to be here <br>";
						continue;
					}
					if (isset($folders[$folderName])) continue;
					if (isset($autoFolderObjects[$folderName])) continue;
					if (empty($delimiter)||$delimiter != $foldersNameSpace[$type]['delimiter']) $delimiter = $foldersNameSpace[$type]['delimiter'];
					$folderParts = explode($delimiter, $folderName);
					$shortName = array_pop($folderParts);

					$folderObject = new \stdClass;
					$folderObject->delimiter	= $delimiter;
					$folderObject->folderName	= $folderName;
					$folderObject->shortFolderName	= $shortName;
					if(!$_subscribedOnly) {
						#echo $folderName."->".$type."<br>";
						#_debug_array($foldersNameSpace[$type]['subscribed']);
						$folderObject->subscribed = in_array($folderName, (array)$foldersNameSpace[$type]['subscribed']);
					}

					if($_getCounters == true) {
						//error_log(__METHOD__.' ('.__LINE__.') '.' getCounter forFolder:'.$folderName);
						$folderObject->counter = $this->getMailBoxCounters($folderName);
					}
					if(strtoupper($folderName) == 'INBOX') {
						$folderName = 'INBOX';
						$folderObject->folderName	= 'INBOX';
						$folderObject->shortFolderName	= 'INBOX';
						$folderObject->displayName	= lang('INBOX');
						$folderObject->shortDisplayName = lang('INBOX');
						$folderObject->subscribed	= true;
					// translate the automatic Folders (Sent, Drafts, ...) like the INBOX
					} elseif (in_array($shortName,self::$autoFolders)) {
						$tmpfolderparts = explode($delimiter,$folderObject->folderName);
						array_pop($tmpfolderparts);
						$folderObject->displayName = implode($delimiter,$tmpfolderparts).$delimiter.lang($shortName);
						$folderObject->shortDisplayName = lang($shortName);
						unset($tmpfolderparts);
					} else {
						$folderObject->displayName = $folderObject->folderName;
						$folderObject->shortDisplayName = $shortName;
					}
					//$folderName = $folderName;
					if (in_array($shortName,self::$autoFolders)&&self::searchValueInFolderObjects($shortName,$autoFolderObjects)===false) {
						$autoFolderObjects[$folderName] = $folderObject;
					} else {
						$folders[$folderName] = $folderObject;
					}
					//error_log(__METHOD__.' ('.__LINE__.') '.':'.$folderObject->folderName);
					if (!isset(self::$specialUseFolders)) $this->getSpecialUseFolders ();
					if (isset(self::$specialUseFolders[$folderName]))
					{
						$autofolder_exists[$folderName] = self::$specialUseFolders[$folderName];
					}
				}
			}
		}
		if (is_array($autoFolderObjects) && !empty($autoFolderObjects)) {
			uasort($autoFolderObjects,array($this,"sortByAutoFolderPos"));
		}
		// check if some standard folders are missing and need to be created
		if (count($autofolder_exists) < count(self::$autoFolders) && $this->check_create_autofolders($autofolder_exists))
		{
			// if new folders have been created, re-read folders ignoring the cache
			return $this->getFolderObjects($_subscribedOnly, $_getCounters, $_alwaysGetDefaultFolders, false);	// false = do NOT use cache
		}
		if (is_array($folders)) uasort($folders,array($this,"sortByDisplayName"));
		//$folders2return = array_merge($autoFolderObjects,$folders);
		//_debug_array($folders2return); #exit;
		$folders2return[$this->icServer->ImapServerId] = array_merge((array)$inboxFolderObject,(array)$autoFolderObjects,(array)$folders);
		if (($_subscribedOnly && $_getCounters===false) ||
			($_subscribedOnly == false && $_getCounters===false &&
			isset($this->mailPreferences['showAllFoldersInFolderPane']) &&
			$this->mailPreferences['showAllFoldersInFolderPane']==1))
		{
			Cache::setCache(Cache::INSTANCE,'email','folderObjects'.trim($GLOBALS['egw_info']['user']['account_id']),$folders2return,$expiration=60*60*1);
		}
		Cache::setCache(Cache::INSTANCE,'email','folderBasicInfo'.trim($GLOBALS['egw_info']['user']['account_id']),$folderBasicInfo,$expiration=60*60*1);
		if (self::$debugTimes) self::logRunTimes($starttime,null,function_backtrace(),__METHOD__.' ('.__LINE__.') ');
		return $folders2return[$this->icServer->ImapServerId];
	}

	/**
	 * Get IMAP folders for a mailbox
	 *
	 * @param string $_nodePath = null folder name to fetch from IMAP,
	 *			null means all folders
	 * @param boolean $_onlyTopLevel if set to true only top level objects
	 *			will be return and nodePath would be ignored
	 * @param int $_search = 2 search restriction in given mailbox
	 *	0:All folders recursively from the $_nodePath
	 *  1:Only folder of specified $_nodePath
	 *	2:All folders of $_nodePath in the same heirachy level
	 *
	 * @param boolean $_subscribedOnly = false Command to fetch only the subscribed folders
	 * @param boolean $_getCounter = false Command to fetch mailbox counter
	 *
	 * @return array arrays of folders
	 */
	function getFolderArrays ($_nodePath = null, $_onlyTopLevel = false, $_search= 2, $_subscribedOnly = false, $_getCounter = false)
	{
		// delimiter
		$delimiter = $this->getHierarchyDelimiter();

		$folders = $nameSpace =  array();
		$nameSpaceTmp = $this->_getNameSpaces();
		foreach($nameSpaceTmp as $k => $singleNameSpace) {
			$nameSpace[$singleNameSpace['type']]=$singleNameSpace;
		}
		unset($nameSpaceTmp);

		//error_log(__METHOD__.__LINE__.array2string($nameSpace));
		// Get special use folders
		if (!isset(self::$specialUseFolders)) $this->getSpecialUseFolders (); // Set self::$specialUseFolders
		// topLevelQueries generally ignore the $_search param. Except for Config::examineNamespace
		if ($_onlyTopLevel) // top level leaves
		{
			// Get top mailboxes of icServer
			$topFolders = $this->icServer->getMailboxes("", 2, true);
			// Trigger examination of namespace to retrieve
			// folders located in other and shared; needed only for some servers
			if (!isset(self::$mailConfig)) self::$mailConfig = Config::read('mail');
			if (!empty(self::$mailConfig['examineNamespace']))
			{
				$prefixes=array();
				if (is_array($nameSpace))
				{
					foreach($nameSpace as $k => $singleNameSpace) {
						$type = $singleNameSpace['type'];

						if(is_array($singleNameSpace) && $singleNameSpace['prefix']){
							$prefixes[$type] = $singleNameSpace['prefix'];
							//regard extra care for nameSpacequeries when configured AND respect $_search
							$result = $this->icServer->getMailboxes($singleNameSpace['prefix'], $_search==0?0:2, true);
							if (is_array($result))
							{
								ksort($result);
								$topFolders = array_merge($topFolders,$result);
							}
						}
					}
				}
			}

			$autofolders = array();

			foreach(self::$specialUseFolders as $path => $folder)
			{
				if ($this->folderExists($path))
				{
					$autofolders[$folder] = $folder;
				}
			}
			// Check if the special use folders are there, otherwise try to create them
			if (count($autofolders) < count(self::$autoFolders) && $this->check_create_autofolders ($autofolders))
			{
				return $this->getFolderArrays ($_nodePath, $_onlyTopLevel, $_search, $_subscribedOnly, $_getCounter);
			}

			// now process topFolders for next level
			foreach ($topFolders as &$node)
			{
				$pattern = "/\\".$delimiter."/";
				$reference = preg_replace($pattern, '', $node['MAILBOX']);
				if(!empty($prefixes))
				{
					$reference = '';
					$tmpArray = explode($delimiter,$node['MAILBOX']);
					foreach($tmpArray as $p)
					{
						$reference = empty($reference)?$p:$reference.$delimiter.$p;
					}
				}
				$mainFolder = $subFolders = array();

				if ($_subscribedOnly)
				{
					$mainFolder = $this->icServer->listSubscribedMailboxes($reference, 1, true);
					$subFolders = $this->icServer->listSubscribedMailboxes($node['MAILBOX'].$node['delimiter'], $_search, true);
				}
				else
				{
					$mainFolder = $this->icServer->getMailboxes($reference, 1, true);
					$subFolders = $this->icServer->getMailboxes($node['MAILBOX'].$node['delimiter'], $_search, true);
				}

				if (isset($mainFolder['INBOX']) && is_array($mainFolder['INBOX']))
				{
					// Array container of auto folders
					$aFolders = array();

					// Array container of non auto folders
					$nFolders = array();

					foreach ((array)$subFolders as $path => $folder)
					{
						$folderInfo = self::pathToFolderData($folder['MAILBOX'], $folder['delimiter']);
						if (in_array(trim($folderInfo['name']), $autofolders) || in_array(trim($folderInfo['name']), self::$autoFolders))
						{
							$aFolders [$path] = $folder;
						}
						else
						{
							$nFolders [$path] = $folder;
						}
					}
					if (is_array($aFolders)) uasort ($aFolders, array($this,'sortByAutofolder'));
					//ksort($aFolders);

					// Sort none auto folders base on mailbox name
					uasort($nFolders,array($this,'sortByMailbox'));

					$subFolders = array_merge($aFolders,$nFolders);
				}
				else
				{
					if (is_array($subFolders)) ksort($subFolders);
				}
				$folders = array_merge($folders,(array)$mainFolder, (array)$subFolders);
			}
		}
		elseif ($_nodePath) // single node
		{
			switch ($_search)
			{
				// Including children
				case 0:
				case 2:
					$path = $_nodePath.''.$delimiter;
					break;
				// Node itself
				// shouldn't contain next level delimiter
				case 1:
					$path = $_nodePath;
					break;
			}
			if ($_subscribedOnly)
			{
				$folders = $this->icServer->listSubscribedMailboxes($path, $_search, true);
			}
			else
			{
				$folders = $this->icServer->getMailboxes($path, $_search, true);
			}

			if (is_array($folders)) uasort($folders, array($this,'sortByMailbox'));
		}
		elseif(!$_nodePath) // all
		{
			if ($_subscribedOnly)
			{
				$folders = $this->icServer->listSubscribedMailboxes('', 0, true);
			}
			else
			{
				$folders = $this->icServer->getMailboxes('', 0, true);
			}
		}
		// only sort (autofolders, shared, others ...) when retrieving all folders or toplevelquery
		if ($_onlyTopLevel || !$_nodePath)
		{
			// SORTING FOLDERS
			//self::$debugTimes=true;
			if (self::$debugTimes) $starttime = microtime (true);
			// Merge of all auto folders and specialusefolders
			$autoFoldersTmp = array_unique((array_merge(self::$autoFolders, array_values(self::$specialUseFolders))));
			if (is_array($folders)) uasort($folders,array($this,'sortByMailbox'));//ksort($folders);
			$tmpFolders = $folders;
			$inboxFolderObject=$inboxSubFolderObjects=$autoFolderObjects=$typeFolderObject=$mySpecialUseFolders=array();
			$googleMailFolderObject=$googleAutoFolderObjects=$googleSubFolderObjects=array();
			$isGoogleMail=false;
			foreach($autoFoldersTmp as $afk=>$aF)
			{
				if (!isset($mySpecialUseFolders[$aF]) && $aF) $mySpecialUseFolders[$aF]=$this->getFolderByType($aF,false);
				//error_log($afk.':'.$aF.'->'.$mySpecialUseFolders[$aF]);
			}
			//error_log(array2string($mySpecialUseFolders));
			foreach ($tmpFolders as $k => $f) {
				$sorted=false;
				if (strtoupper(substr($k,0,5))=='INBOX') {
					if (strtoupper($k)=='INBOX') {
						//error_log(__METHOD__.__LINE__.':'.strtoupper(substr($k,0,5)).':'.$k);
						$inboxFolderObject[$k]=$f;
						unset($folders[$k]);
						$sorted=true;
					} else {
						$isAutoFolder=false;
						foreach($autoFoldersTmp as $afk=>$aF)
						{
							//error_log(__METHOD__.__LINE__.$k.':'.$aF.'->'.$mySpecialUseFolders[$aF]);
							if($aF && strlen($mySpecialUseFolders[$aF])&&/*strlen($k)>=strlen($mySpecialUseFolders[$aF])&&*/
								($mySpecialUseFolders[$aF]==$k || substr($k,0,strlen($mySpecialUseFolders[$aF].$delimiter))==$mySpecialUseFolders[$aF].$delimiter || //k may be child of an autofolder
								stristr($mySpecialUseFolders[$aF],$k.$delimiter)!==false)) // k is parent of an autofolder
							{
								//error_log(__METHOD__.__LINE__.$k.'->'.$mySpecialUseFolders[$aF]);
								$isAutoFolder=true;
								$autoFolderObjects[$k]=$f;
								break;
							}
						}
						if ($isAutoFolder==false) $inboxSubFolderObjects[$k]=$f;
						unset($folders[$k]);
						$sorted=true;
					}
				} elseif (strtoupper(substr($k,0,13))=='[GOOGLE MAIL]') {
					$isGoogleMail=true;
					if (strtoupper($k)=='[GOOGLE MAIL]') {
						$googleMailFolderObject[$k]=$f;
						unset($folders[$k]);
						$sorted=true;
					} else {
						$isAutoFolder=false;
						foreach($autoFoldersTmp as $afk=>$aF)
						{
							//error_log($k.':'.$aF.'->'.$mySpecialUseFolders[$aF]);
							if($aF && strlen($mySpecialUseFolders[$aF])&&/*strlen($k)>=strlen($mySpecialUseFolders[$aF])&&*/
								($mySpecialUseFolders[$aF]==$k || substr($k,0,strlen($mySpecialUseFolders[$aF].$delimiter))==$mySpecialUseFolders[$aF].$delimiter|| //k may be child of an autofolder
								stristr($mySpecialUseFolders[$aF],$k.$delimiter)!==false)) // k is parent of an autofolder
							{
								//error_log($k.'->'.$mySpecialUseFolders[$aF]);
								$isAutoFolder=true;
								$googleAutoFolderObjects[$k]=$f;
								break;
							}
						}
						if ($isAutoFolder==false) $googleSubFolderObjects[$k]=$f;
						unset($folders[$k]);
						$sorted=true;
					}
				} else {
					$isAutoFolder=false;
					foreach($autoFoldersTmp as $afk=>$aF)
					{
						//error_log($k.':'.$aF.'->'.$mySpecialUseFolders[$aF]);
						if($aF && strlen($mySpecialUseFolders[$aF])&&/*strlen($k)>=strlen($mySpecialUseFolders[$aF])&&*/
								($mySpecialUseFolders[$aF]==$k || substr($k,0,strlen($mySpecialUseFolders[$aF].$delimiter))==$mySpecialUseFolders[$aF].$delimiter|| //k may be child of an autofolder
								stristr($mySpecialUseFolders[$aF],$k.$delimiter)!==false)) // k is parent of an autofolder
						{
							//error_log($k.'->'.$mySpecialUseFolders[$aF]);
							$isAutoFolder=true;
							$autoFolderObjects[$k]=$f;
							unset($folders[$k]);
							$sorted=true;
							break;
						}
					}
				}

				if ($sorted==false)
				{
					foreach(array('others','shared') as $type)
					{
						if (!empty($nameSpace[$type]['prefix_present']) && !empty($nameSpace[$type]['prefix']))
						{
							if (substr($k,0,strlen($nameSpace[$type]['prefix']))==$nameSpace[$type]['prefix']||
								substr($k,0,strlen($nameSpace[$type]['prefix'])-strlen($nameSpace[$type]['delimiter']))==substr($nameSpace[$type]['prefix'],0,strlen($nameSpace[$type]['delimiter'])*-1)) {
								//error_log(__METHOD__.__LINE__.':'.substr($k,0,strlen($nameSpace[$type]['prefix'])).':'.$k);
								$typeFolderObject[$type][$k]=$f;
								unset($folders[$k]);
							}
						}
					}
				}
			}
			//error_log(__METHOD__.__LINE__.array2string($autoFolderObjects));
			// avoid calling sortByAutoFolder as it is not regarding subfolders
			$autoFolderObjectsTmp = $autoFolderObjects;
			unset($autoFolderObjects);
			uasort($autoFolderObjectsTmp, array($this,'sortByMailbox'));
			foreach($autoFoldersTmp as $afk=>$aF)
			{
				foreach($autoFolderObjectsTmp as $k => $f)
				{
					if($aF && ($mySpecialUseFolders[$aF]==$k ||
						substr($k,0,strlen($mySpecialUseFolders[$aF].$delimiter))==$mySpecialUseFolders[$aF].$delimiter ||
						stristr($mySpecialUseFolders[$aF],$k.$delimiter)!==false))
					{
						$autoFolderObjects[$k]=$f;
					}
				}
			}
			//error_log(__METHOD__.__LINE__.array2string($autoFolderObjects));
			if (!$isGoogleMail) {
				$folders = array_merge($inboxFolderObject,$autoFolderObjects,(array)$inboxSubFolderObjects,(array)$folders,(array)($typeFolderObject['others'] ?? []),(array)($typeFolderObject['shared'] ?? []));
			} else {
				// avoid calling sortByAutoFolder as it is not regarding subfolders
				$gAutoFolderObjectsTmp = $googleAutoFolderObjects;
				unset($googleAutoFolderObjects);
				uasort($gAutoFolderObjectsTmp, array($this,'sortByMailbox'));
				foreach($autoFoldersTmp as $afk=>$aF)
				{
					foreach($gAutoFolderObjectsTmp as $k => $f)
					{
						if($aF && ($mySpecialUseFolders[$aF]==$k || substr($k,0,strlen($mySpecialUseFolders[$aF].$delimiter))==$mySpecialUseFolders[$aF].$delimiter))
						{
							$googleAutoFolderObjects[$k]=$f;
						}
					}
				}
				$folders = array_merge($inboxFolderObject,$autoFolderObjects,(array)$folders,(array)$googleMailFolderObject,$googleAutoFolderObjects,$googleSubFolderObjects,(array)$typeFolderObject['others'],(array)$typeFolderObject['shared']);
			}
			if (self::$debugTimes) self::logRunTimes($starttime,null,function_backtrace(),__METHOD__.' ('.__LINE__.') Sorting:');
			//self::$debugTimes=false;
		}
		// Get counter information and add them to each fetched folders array
		// TODO:  do not fetch counters for user .... as in shared / others
		if ($_getCounter)
		{
			foreach ($folders as &$folder)
			{
				$folder['counter'] = $this->icServer->getMailboxCounters($folder['MAILBOX']);
			}
		}
		return $folders;
	}


	/**
	 * Check if all automatic folders exist and create them if not
	 *
	 * @param array $autofolders_exists existing folders, no need to check their existance again
	 * @return int number of new folders created
	 */
	function check_create_autofolders(array $autofolders_exists=array())
	{
		$num_created = 0;
		foreach(self::$autoFolders as $folder)
		{
			$created = false;
			if (!in_array($folder, $autofolders_exists) && $this->_getSpecialUseFolder($folder, true, $created) &&
				$created && $folder != 'Outbox')
			{
				$num_created++;
			}
		}
		return $num_created;
	}

	/**
	 * search Value In FolderObjects
	 *
	 * Helper function to search for a specific value within the foldertree objects
	 * @param string $needle
	 * @param array $haystack array of folderobjects
	 * @return MIXED false or key
	 */
	static function searchValueInFolderObjects($needle, $haystack)
	{
		$rv = false;
		foreach ($haystack as $k => $v)
		{
			foreach($v as &$sv) {if (trim($sv)==trim($needle)) return $k;}
		}
		return $rv;
	}

	/**
	 * sortByMailbox
	 *
	 * Helper function to sort folders array by mailbox
	 * @param array $a
	 * @param array $b array of folders
	 * @return int expect values (0, 1 or -1)
	 */
	function sortByMailbox($a,$b)
	{
		return strcasecmp($a['MAILBOX'],$b['MAILBOX']);
	}

	/**
	 * Get folder data from path
	 *
	 * @param string $_path a node path
	 * @param string $_hDelimiter hierarchy delimiter
	 * @return array returns an array of data extracted from given node path
	 */
	static function pathToFolderData ($_path, $_hDelimiter)
	{
		if (!strpos($_path, self::DELIMITER)) $_path = self::DELIMITER.$_path;
		list(,$path) = explode(self::DELIMITER, $_path);
		$path_chain = $parts = explode($_hDelimiter, $path);
		$name = array_pop($parts);
		return array (
			'name' => $name,
			'mailbox' => $path,
			'parent' => implode($_hDelimiter, $parts),
			'text' => $name,
			'tooltip' => $name,
			'path' => $path_chain
		);
	}

	/**
	 * sortByAutoFolder
	 *
	 * Helper function to sort folder-objects by auto Folder Position
	 * @param array $_a
	 * @param array $_b
	 * @return int expect values (0, 1 or -1)
	 */
	function sortByAutoFolder($_a, $_b)
	{
		// 0, 1 und -1
		$a = self::pathToFolderData($_a['MAILBOX'], $_a['delimiter']);
		$b = self::pathToFolderData($_b['MAILBOX'], $_b['delimiter']);
		$pos1 = array_search(trim($a['name']),self::$autoFolders);
		$pos2 = array_search(trim($b['name']),self::$autoFolders);
		if ($pos1 == $pos2) return 0;
		return ($pos1 < $pos2) ? -1 : 1;
	}

	/**
	 * sortByDisplayName
	 *
	 * Helper function to sort folder-objects by displayname
	 * @param object $a
	 * @param object $b array of folderobjects
	 * @return int expect values (0, 1 or -1)
	 */
	function sortByDisplayName($a,$b)
	{
		// 0, 1 und -1
		return strcasecmp($a->displayName,$b->displayName);
	}

	/**
	 * sortByAutoFolderPos
	 *
	 * Helper function to sort folder-objects by auto Folder Position
	 * @param object $a
	 * @param object $b array of folderobjects
	 * @return int expect values (0, 1 or -1)
	 */
	function sortByAutoFolderPos($a,$b)
	{
		// 0, 1 und -1
		$pos1 = array_search(trim($a->shortFolderName),self::$autoFolders);
		$pos2 = array_search(trim($b->shortFolderName),self::$autoFolders);
		if ($pos1 == $pos2) return 0;
		return ($pos1 < $pos2) ? -1 : 1;
	}

	/**
	 * getMailBoxCounters
	 *
	 * function to retrieve the counters for a given folder
	 * @param string $folderName
	 * @param boolean $_returnObject return the counters as object rather than an array
	 * @return mixed false or array of counters array(MESSAGES,UNSEEN,RECENT,UIDNEXT,UIDVALIDITY) or object
	 */
	function getMailBoxCounters($folderName,$_returnObject=true)
	{
		try
		{
			$folderStatus = $this->icServer->getMailboxCounters($folderName);
			//error_log(__METHOD__.' ('.__LINE__.') '.$folderName.": FolderStatus:".array2string($folderStatus).function_backtrace());
		}
		catch (\Exception $e)
		{
			if (self::$debug) error_log(__METHOD__." returned FolderStatus for Folder $folderName:".$e->getMessage());
			return false;
		}
		if(is_array($folderStatus)) {
			if ($_returnObject===false) return $folderStatus;
			$status =  new \stdClass;
			$status->messages   = $folderStatus['MESSAGES'];
			$status->unseen     = $folderStatus['UNSEEN'];
			$status->recent     = $folderStatus['RECENT'];
			$status->uidnext        = $folderStatus['UIDNEXT'];
			$status->uidvalidity    = $folderStatus['UIDVALIDITY'];

			return $status;
		}
		return false;
	}

	/**
	 * getMailBoxesRecursive
	 *
	 * function to retrieve mailboxes recursively from given mailbox
	 * @param string $_mailbox
	 * @param string $delimiter
	 * @param string $prefix
	 * @param string $reclevel 0, counter to keep track of the current recursionlevel
	 * @return array of mailboxes
	 */
	function getMailBoxesRecursive($_mailbox, $delimiter, $prefix, $reclevel=0)
	{
		#echo __METHOD__." retrieve SubFolders for $_mailbox$delimiter <br>";
		$maxreclevel=25;
		if ($reclevel > $maxreclevel) {
			error_log( __METHOD__." Recursion Level Exeeded ($reclevel) while looking up $_mailbox$delimiter ");
			return array();
		}
		$reclevel++;
		// clean up double delimiters
		$_mailbox = preg_replace('~'.($delimiter == '.' ? "\\".$delimiter:$delimiter).'+~s',$delimiter,$_mailbox);
		//get that mailbox in question
		$mbx = $this->icServer->getMailboxes($_mailbox,1,true);
		$mbxkeys = array_keys($mbx);
		#_debug_array($mbx);
//error_log(__METHOD__.' ('.__LINE__.') '.' Delimiter:'.array2string($delimiter));
//error_log(__METHOD__.' ('.__LINE__.') '.array2string($mbx));
		// Example: Array([INBOX/GaGa] => Array([MAILBOX] => INBOX/GaGa[ATTRIBUTES] => Array([0] => \\unmarked)[delimiter] => /))
		if (is_array($mbx[$mbxkeys[0]]["ATTRIBUTES"]) && (in_array('\HasChildren',$mbx[$mbxkeys[0]]["ATTRIBUTES"]) || in_array('\Haschildren',$mbx[$mbxkeys[0]]["ATTRIBUTES"]) || in_array('\haschildren',$mbx[$mbxkeys[0]]["ATTRIBUTES"]))) {
			// if there are children fetch them
			//echo $mbx[$mbxkeys[0]]['MAILBOX']."<br>";

			$buff = $this->icServer->getMailboxes($mbx[$mbxkeys[0]]['MAILBOX'].($mbx[$mbxkeys[0]]['MAILBOX'] == $prefix ? '':$delimiter),2,false);
			//$buff = $this->icServer->getMailboxes($mbx[$mbxkeys[0]]['MAILBOX'],2,false);
			//_debug_array($buff);
			$allMailboxes = array();
			foreach ($buff as $mbxname) {
//error_log(__METHOD__.' ('.__LINE__.') '.array2string($mbxname));
				$mbxname = preg_replace('~'.($delimiter == '.' ? "\\".$delimiter:$delimiter).'+~s',$delimiter,$mbxname['MAILBOX']);
				#echo "About to recur in level $reclevel:".$mbxname."<br>";
				if ( $mbxname != $mbx[$mbxkeys[0]]['MAILBOX'] && $mbxname != $prefix  && $mbxname != $mbx[$mbxkeys[0]]['MAILBOX'].$delimiter)
				{
					$allMailboxes = array_merge($allMailboxes, self::getMailBoxesRecursive($mbxname, $delimiter, $prefix, $reclevel));
				}
			}
			if (!(in_array('\NoSelect',$mbx[$mbxkeys[0]]["ATTRIBUTES"]) || in_array('\Noselect',$mbx[$mbxkeys[0]]["ATTRIBUTES"]) || in_array('\noselect',$mbx[$mbxkeys[0]]["ATTRIBUTES"]))) $allMailboxes[] = $mbx[$mbxkeys[0]]['MAILBOX'];
			return $allMailboxes;
		} else {
			return array($_mailbox);
		}
	}

	/**
	 * _getSpecialUseFolder
	 * abstraction layer for getDraftFolder, getTemplateFolder, getTrashFolder and getSentFolder
	 * @param string $_type the type to fetch (Drafts|Template|Trash|Sent)
	 * @param boolean $_checkexistance trigger check for existance
	 * @param boolean& $created =null on return true: if folder was just created, false if not
	 * @return mixed string or false
	 */
	function _getSpecialUseFolder($_type, $_checkexistance=TRUE, &$created=null)
	{
		static $types = array(
			'Drafts'   => array('profileKey'=>'acc_folder_draft','autoFolderName'=>'Drafts'),
			'Template' => array('profileKey'=>'acc_folder_template','autoFolderName'=>'Templates'),
			'Trash'    => array('profileKey'=>'acc_folder_trash','autoFolderName'=>'Trash'),
			'Sent'     => array('profileKey'=>'acc_folder_sent','autoFolderName'=>'Sent'),
			'Junk'     => array('profileKey'=>'acc_folder_junk','autoFolderName'=>'Junk'),
			'Outbox'   => array('profileKey'=>'acc_folder_outbox','autoFolderName'=>'Outbox'),
			'Archive'   => array('profileKey'=>'acc_folder_archive','autoFolderName'=>'Archive'),
		);
		if ($_type == 'Templates') $_type = 'Template';	// for some reason self::$autofolders uses 'Templates'!
		$created = false;
		if (!isset($types[$_type]))
		{
			error_log(__METHOD__.' ('.__LINE__.') '.' '.$_type.' not supported for '.__METHOD__);
			return false;
		}
		if (!isset(self::$specialUseFolders) || empty(self::$specialUseFolders)) self::$specialUseFolders = $this->getSpecialUseFolders();

		//highest precedence
		try
		{
			$_folderName = $this->icServer->{$types[$_type]['profileKey']};
		}
		catch (\Exception $e)
		{
			// we know that outbox is not supported, but we use this here, as we autocreate expected SpecialUseFolders in this function
			if ($_type != 'Outbox') error_log(__METHOD__.' ('.__LINE__.') '.' Failed to retrieve Folder for '.array2string($types[$_type]).":".$e->getMessage());
			$_folderName = false;
		}
		// do not try to autocreate configured Archive-Folder. Return false if configured folder does not exist
		if ($_type == 'Archive') {
			if ($_folderName && $_checkexistance && strtolower($_folderName) !='none' && !$this->folderExists($_folderName,true)) {
				return false;
			} else {
				return $_folderName;
			}

		}
		// does the folder exist??? (is configured/preset, but non-existent)
		if ($_folderName && $_checkexistance && strtolower($_folderName) !='none' && !$this->folderExists($_folderName,true)) {
			try
			{
				$error = null;
				if (($_folderName = $this->createFolder('', $_folderName, $error))) $created = true;
				if ($error) error_log(__METHOD__.' ('.__LINE__.') '.' Failed to create Folder '.$_folderName." for $_type:".$error);
			}
			catch(Exception $e)
			{
				error_log(__METHOD__.' ('.__LINE__.') '.' Failed to create Folder '.$_folderName." for $_type:".$e->getMessage().':'.function_backtrace());
				$_folderName = false;
			}
		}
		// not sure yet if false is the correct behavior on none
		if ($_folderName =='none') return 'none' ; //false;
		//no (valid) folder found yet; try specialUseFolders
		if (empty($_folderName) && is_array(self::$specialUseFolders) && ($f = array_search($_type,self::$specialUseFolders))) $_folderName = $f;
		//no specialUseFolder; try some Defaults
		if (empty($_folderName) && isset($types[$_type]))
		{
			$nameSpace = $this->_getNameSpaces();
			$prefix='';
			foreach ($nameSpace as $nSp)
			{
				if ($nSp['type']=='personal')
				{
					//error_log(__METHOD__.__LINE__.array2string($nSp));
					$prefix = $nSp['prefix'];
					break;
				}
			}
			if ($this->folderExists($prefix.$types[$_type]['autoFolderName'],true))
			{
				$_folderName = $prefix.$types[$_type]['autoFolderName'];
			}
			else
			{
				try
				{
					$error = null;
					$this->createFolder('', $prefix.$types[$_type]['autoFolderName'],$error);
					$_folderName = $prefix.$types[$_type]['autoFolderName'];
					if ($error) error_log(__METHOD__.' ('.__LINE__.') '.' Failed to create Folder '.$_folderName." for $_type:".$error);
				}
				catch(Exception $e)
				{
					error_log(__METHOD__.' ('.__LINE__.') '.' Failed to create Folder '.$_folderName." for $_type:".$e->getMessage());
					$_folderName = false;
				}
			}
		}
		return $_folderName;
	}

	/**
	 * getFolderByType wrapper for _getSpecialUseFolder Type as param
	 * @param string $type foldertype to look for
	 * @param boolean $_checkexistance trigger check for existance
	 * @return mixed string or false
	 */
	function getFolderByType($type, $_checkexistance=false)
	{
		return $this->_getSpecialUseFolder($type, $_checkexistance);
	}

	/**
	 * getJunkFolder wrapper for _getSpecialUseFolder Type Junk
	 * @param boolean $_checkexistance trigger check for existance
	 * @return mixed string or false
	 */
	function getJunkFolder($_checkexistance=TRUE)
	{
		return $this->_getSpecialUseFolder('Junk', $_checkexistance);
	}

	/**
	 * getDraftFolder wrapper for _getSpecialUseFolder Type Drafts
	 * @param boolean $_checkexistance trigger check for existance
	 * @return mixed string or false
	 */
	function getDraftFolder($_checkexistance=TRUE)
	{
		return $this->_getSpecialUseFolder('Drafts', $_checkexistance);
	}

	/**
	 * getTemplateFolder wrapper for _getSpecialUseFolder Type Template
	 * @param boolean $_checkexistance trigger check for existance
	 * @return mixed string or false
	 */
	function getTemplateFolder($_checkexistance=TRUE)
	{
		return $this->_getSpecialUseFolder('Template', $_checkexistance);
	}

	/**
	 * getTrashFolder wrapper for _getSpecialUseFolder Type Trash
	 * @param boolean $_checkexistance trigger check for existance
	 * @return mixed string or false
	 */
	function getTrashFolder($_checkexistance=TRUE)
	{
		return $this->_getSpecialUseFolder('Trash', $_checkexistance);
	}

	/**
	 * getSentFolder wrapper for _getSpecialUseFolder Type Sent
	 * @param boolean $_checkexistance trigger check for existance
	 * @return mixed string or false
	 */
	function getSentFolder($_checkexistance=TRUE)
	{
		return $this->_getSpecialUseFolder('Sent', $_checkexistance);
	}

	/**
	 * getOutboxFolder wrapper for _getSpecialUseFolder Type Outbox
	 * @param boolean $_checkexistance trigger check for existance
	 * @return mixed string or false
	 */
	function getOutboxFolder($_checkexistance=TRUE)
	{
		return $this->_getSpecialUseFolder('Outbox', $_checkexistance);
	}

	/**
	 * getArchiveFolder wrapper for _getSpecialUseFolder Type Archive
	 * @param boolean $_checkexistance trigger check for existance . We do no autocreation for configured Archive folder
	 * @return mixed string or false
	 */
	function getArchiveFolder($_checkexistance=TRUE)
	{
		return $this->_getSpecialUseFolder('Archive', $_checkexistance);
	}

	/**
	 * isSentFolder is the given folder the sent folder or at least a subfolder of it
	 * @param string $_folderName folder to perform the check on
	 * @param boolean $_checkexistance trigger check for existance
	 * @param boolean $_exactMatch make the check more strict. return false if folder is subfolder only
	 * @return boolean
	 */
	function isSentFolder($_folderName, $_checkexistance=TRUE, $_exactMatch=false)
	{
		$sentFolder = $this->getSentFolder($_checkexistance);
		if(empty($sentFolder)) {
			return false;
		}
		// does the folder exist???
		if ($_checkexistance && !$this->folderExists($_folderName)) {
			return false;
		}

		if ($_exactMatch)
		{
			if(false !== stripos($_folderName, $sentFolder)&& strlen($_folderName)==strlen($sentFolder)) {
				return true;
			} else {
				return false;
			}
		} else {
			if(false !== stripos($_folderName, $sentFolder)) {
				return true;
			} else {
				return false;
			}
		}
	}

	/**
	 * checks if the Outbox folder exists and is part of the foldername to be checked
	 * @param string $_folderName folder to perform the check on
	 * @param boolean $_checkexistance trigger check for existance
	 * @param boolean $_exactMatch make the check more strict. return false if folder is subfolder only
	 * @return boolean
	 */
	function isOutbox($_folderName, $_checkexistance=TRUE, $_exactMatch=false)
	{
		if (stripos($_folderName, 'Outbox')===false) {
			return false;
		}
		// does the folder exist???
		if ($_checkexistance && $GLOBALS['egw_info']['user']['apps']['activesync'] && !$this->folderExists($_folderName)) {
			$outboxFolder = $this->getOutboxFolder($_checkexistance);
			if ($_exactMatch)
			{
				if(false !== stripos($_folderName, $outboxFolder)&& strlen($_folderName)==strlen($outboxFolder)) {
					return true;
				} else {
					return false;
				}
			} else {
				if(false !== stripos($_folderName, $outboxFolder)) {
					return true;
				} else {
					return false;
				}
			}
		}
		return true;
	}

	/**
	 * isDraftFolder is the given folder the sent folder or at least a subfolder of it
	 * @param string $_folderName folder to perform the check on
	 * @param boolean $_checkexistance trigger check for existance
	 * @param boolean $_exactMatch make the check more strict. return false if folder is subfolder only
	 * @return boolean
	 */
	function isDraftFolder($_folderName, $_checkexistance=TRUE, $_exactMatch=false)
	{
		$draftFolder = $this->getDraftFolder($_checkexistance);
		if(empty($draftFolder)) {
			return false;
		}
		// does the folder exist???
		if ($_checkexistance && !$this->folderExists($_folderName)) {
			return false;
		}
		if (is_a($_folderName,"Horde_Imap_Client_Mailbox")) $_folderName = $_folderName->utf8;
		if ($_exactMatch)
		{
			if(false !== stripos($_folderName, $draftFolder)&& strlen($_folderName)==strlen($draftFolder)) {
				return true;
			} else {
				return false;
			}
		} else {
			if(false !== stripos($_folderName, $draftFolder)) {
				return true;
			} else {
				return false;
			}
		}
	}

	/**
	 * isTrashFolder is the given folder the sent folder or at least a subfolder of it
	 * @param string $_folderName folder to perform the check on
	 * @param boolean $_checkexistance trigger check for existance
	 * @param boolean $_exactMatch make the check more strict. return false if folder is subfolder only
	 * @return boolean
	 */
	function isTrashFolder($_folderName, $_checkexistance=TRUE, $_exactMatch=false)
	{
		$trashFolder = $this->getTrashFolder($_checkexistance);
		if(empty($trashFolder)) {
			return false;
		}
		// does the folder exist???
		if ($_checkexistance && !$this->folderExists($_folderName)) {
			return false;
		}

		if ($_exactMatch)
		{
			if(false !== stripos($_folderName, $trashFolder)&& strlen($_folderName)==strlen($trashFolder)) {
				return true;
			} else {
				return false;
			}
		} else {
			if(false !== stripos($_folderName, $trashFolder)) {
				return true;
			} else {
				return false;
			}
		}
	}

	/**
	 * isTemplateFolder is the given folder the sent folder or at least a subfolder of it
	 * @param string $_folderName folder to perform the check on
	 * @param boolean $_checkexistance trigger check for existance
	 * @param boolean $_exactMatch make the check more strict. return false if folder is subfolder only
	 * @return boolean
	 */
	function isTemplateFolder($_folderName, $_checkexistance=TRUE, $_exactMatch=false)
	{
		$templateFolder = $this->getTemplateFolder($_checkexistance);
		if(empty($templateFolder)) {
			return false;
		}
		// does the folder exist???
		if ($_checkexistance && !$this->folderExists($_folderName)) {
			return false;
		}
		if ($_exactMatch)
		{
			if(false !== stripos($_folderName, $templateFolder)&& strlen($_folderName)==strlen($templateFolder)) {
				return true;
			} else {
				return false;
			}
		} else {
			if(false !== stripos($_folderName, $templateFolder)) {
				return true;
			} else {
				return false;
			}
		}
	}

	/**
	 * folderExists checks for existance of a given folder
	 * @param string $_folder folder to perform the check on
	 * @param boolean $_forceCheck trigger check for existance on icServer
	 * @return mixed string or false
	 */
	function folderExists($_folder, $_forceCheck=false)
	{
		static $folderInfo = null;
		$forceCheck = $_forceCheck;
		if (empty($_folder))
		{
			// this error is more or less without significance, unless we force the check
			if ($_forceCheck===true) error_log(__METHOD__.' ('.__LINE__.') '.' Called with empty Folder:'.$_folder.function_backtrace());
			return false;
		}
		// when check is not enforced , we assume a folder represented as Horde_Imap_Client_Mailbox as existing folder
		if (is_a($_folder,"Horde_Imap_Client_Mailbox")&&$_forceCheck===false) return true;
		if (is_a($_folder,"Horde_Imap_Client_Mailbox")) $_folder =  $_folder->utf8;
		// reduce traffic within the Instance per User; Expire every 5 hours
		//error_log(__METHOD__.' ('.__LINE__.') '.' Called with Folder:'.$_folder.function_backtrace());
		if (!isset($folderInfo)) $folderInfo = Cache::getCache(Cache::INSTANCE,'email','icServerFolderExistsInfo'.trim($GLOBALS['egw_info']['user']['account_id']),null,array(),$expiration=60*60*5) ?? [];
		//error_log(__METHOD__.' ('.__LINE__.') '.'Cached Info on Folder:'.$_folder.' for Profile:'.$this->profileID.($forceCheck?'(forcedCheck)':'').':'.array2string($folderInfo));
		if (!empty($folderInfo) && isset($folderInfo[$this->profileID]) && isset($folderInfo[$this->profileID][$_folder]) && $forceCheck===false)
		{
			//error_log(__METHOD__.' ('.__LINE__.') '.' Using cached Info on Folder:'.$_folder.' for Profile:'.$this->profileID);
			return $folderInfo[$this->profileID][$_folder];
		}
		else
		{
			if ($forceCheck === false)
			{
				//error_log(__METHOD__.' ('.__LINE__.') '.' No cached Info on Folder:'.$_folder.' for Profile:'.$this->profileID.' FolderExistsInfoCache:'.array2string($folderInfo[$this->profileID]));
				$forceCheck = true; // try to force the check, in case there is no connection, we may need that
			}
		}

		// does the folder exist???
		//error_log(__METHOD__."->Connected?".$this->icServer->_connected.", ".$_folder.", ".($forceCheck?' forceCheck activated':'dont check on server'));
		if ( $forceCheck || empty($folderInfo) || !isset($folderInfo[$this->profileID]) || !isset($folderInfo[$this->profileID][$_folder])) {
			//error_log(__METHOD__."->NotConnected and forceCheck with profile:".$this->profileID);
			//return false;
			//try to connect
			$folderInfo[$this->profileID] = array();
		}
		try
		{
			$folderInfo[$this->profileID][$_folder] = $this->icServer->mailboxExist($_folder);
		}
		catch (\Exception $e)
		{
			error_log(__METHOD__.__LINE__.$e->getMessage().($e->details?', '.$e->details:''));
			self::$profileDefunct[$this->profileID]=$e->getMessage().($e->details?', '.$e->details:'');
			$folderInfo[$this->profileID][$_folder] = false;
		}
		//error_log(__METHOD__.' ('.__LINE__.') '.' Folder Exists:'.$folderInfo[$this->profileID][$_folder].function_backtrace());

		if(!empty($folderInfo) && isset($folderInfo[$this->profileID][$_folder]) &&
			$folderInfo[$this->profileID][$_folder] !== true)
		{
			$folderInfo[$this->profileID][$_folder] = false; // set to false, whatever it was (to have a valid returnvalue for the static return)
		}
		Cache::setCache(Cache::INSTANCE,'email','icServerFolderExistsInfo'.trim($GLOBALS['egw_info']['user']['account_id']),$folderInfo,$expiration=60*60*5);
		return (!empty($folderInfo) && isset($folderInfo[$this->profileID][$_folder]) ? $folderInfo[$this->profileID][$_folder] : false);
	}

	/**
	 * remove any messages which are marked as deleted or
	 * remove any messages from the trashfolder
	 *
	 * @param string _folderName the foldername
	 * @return nothing
	 */
	function compressFolder($_folderName = false)
	{
		$folderName	= $_folderName ?: $this->sessionData['mailbox'];
		$deleteOptions	= $GLOBALS['egw_info']['user']['preferences']['mail']['deleteOptions'];
		$trashFolder	= $this->getTrashFolder();

		$this->icServer->openMailbox($folderName);

		if(strtolower($folderName) == strtolower($trashFolder) && $deleteOptions == "move_to_trash") {
			$this->deleteMessages('all',$folderName,'remove_immediately');
		} else {
			$this->icServer->expunge($folderName);
		}
	}

	/**
	 * delete a Message
	 *
	 * @param mixed array/string _messageUID array of ids to flag, or 'all'
	 * @param string _folder foldername
	 * @param string _forceDeleteMethod - "no", or deleteMethod like 'move_to_trash',"mark_as_deleted","remove_immediately"
	 *
	 * @return bool true, as we do not handle return values yet
	 * @throws Exception
	 */
	function deleteMessages($_messageUID, $_folder=NULL, $_forceDeleteMethod='no')
	{
		//error_log(__METHOD__.' ('.__LINE__.') '.'->'.array2string($_messageUID).','.array2string($_folder).', '.$_forceDeleteMethod);
		$oldMailbox = '';
		if (empty($_folder) && !empty($this->sessionData['mailbox'])) $_folder = $this->sessionData['mailbox'];
		if (empty($_messageUID))
		{
			if (self::$debug) error_log(__METHOD__." no messages Message(s): ".implode(',',$_messageUID));
			return false;
		}
		elseif ($_messageUID==='all')
		{
			$_messageUID= null;
		}
		else
		{
			$uidsToDelete = new Horde_Imap_Client_Ids();
			if (!(is_object($_messageUID) || is_array($_messageUID))) $_messageUID = (array)$_messageUID;
			$uidsToDelete->add($_messageUID);
		}
		$deleteOptions = $_forceDeleteMethod; // use forceDeleteMethod if not "no", or unknown method
		if ($_forceDeleteMethod === 'no' || !in_array($_forceDeleteMethod,array('move_to_trash',"mark_as_deleted","remove_immediately"))) $deleteOptions  = ($this->mailPreferences['deleteOptions']?$this->mailPreferences['deleteOptions']:"mark_as_deleted");
		//error_log(__METHOD__.' ('.__LINE__.') '.'->'.array2string($_messageUID).','.$_folder.'/'.$this->sessionData['mailbox'].' Option:'.$deleteOptions);
		$trashFolder    = $this->getTrashFolder();
		$draftFolder	= $this->getDraftFolder(); //$GLOBALS['egw_info']['user']['preferences']['mail']['draftFolder'];
		$templateFolder = $this->getTemplateFolder(); //$GLOBALS['egw_info']['user']['preferences']['mail']['templateFolder'];
		if((strtolower($_folder) == strtolower($trashFolder) && $deleteOptions == "move_to_trash")) {
			$deleteOptions = "remove_immediately";
		}
		if($this->icServer->getCurrentMailbox() != $_folder) {
			$oldMailbox = $this->icServer->getCurrentMailbox();
			$this->icServer->openMailbox($_folder);
		}
		//error_log(__METHOD__.' ('.__LINE__.') '.'->'.array2string($_messageUID).','.$_folder.'/'.$this->sessionData['mailbox'].' Option:'.$deleteOptions);
		$updateCache = false;
		switch($deleteOptions) {
			case "move_to_trash":
				//error_log(__METHOD__.' ('.__LINE__.') ');
				$updateCache = true;
				if(!empty($trashFolder)) {
					if (self::$debug) error_log(__METHOD__.' ('.__LINE__.') '.implode(' : ', $_messageUID));
					if (self::$debug) error_log(__METHOD__.' ('.__LINE__.') '."$trashFolder <= $_folder / ". $this->sessionData['mailbox']);
					// copy messages
					try
					{
						$this->icServer->copy($_folder, $trashFolder, array('ids'=>$uidsToDelete,'move'=>true));
					}
					catch (\Exception $e)
					{
						throw new Exception("Failed to move Messages (".array2string($uidsToDelete).") from Folder $_folder to $trashFolder Error:".$e->getMessage());
					}
				}
				break;

			case "mark_as_deleted":
				//error_log(__METHOD__.' ('.__LINE__.') ');
				// mark messages as deleted
				if (!isset($_messageUID)) $_messageUID='all';
				foreach((array)$_messageUID as $key =>$uid)
				{
					//flag messages, that are flagged for deletion as seen too
					$this->flagMessages('read', $uid, $_folder);
					$flags = $this->getFlags($uid);
					$this->flagMessages('delete', $uid, $_folder);
					//error_log(__METHOD__.' ('.__LINE__.') '.array2string($flags));
					if (strpos( array2string($flags),'Deleted')!==false) $undelete[] = $uid;
					unset($flags);
				}
				foreach((array)$undelete as $key =>$uid)
				{
					$this->flagMessages('undelete', $uid, $_folder);
				}
				break;

			case "remove_immediately":
				//error_log(__METHOD__.' ('.__LINE__.') ');
				$updateCache = true;
				if (!isset($_messageUID)) $_messageUID='all';
				if (is_object($_messageUID))
				{
					$this->flagMessages('delete', $_messageUID, $_folder);
				}
				else
				{
					foreach((array)$_messageUID as $key =>$uid)
					{
						//flag messages, that are flagged for deletion as seen too
						$this->flagMessages('delete', $uid, $_folder);
					}
				}
				$examineMailbox = $this->icServer->examineMailbox($_folder);
				// examine the folder and if there are messages then try to delete the messages finaly
				if (is_array($examineMailbox) && $examineMailbox['MESSAGES'] > 0) $this->icServer->expunge($_folder);
				break;
		}
		if($oldMailbox != '') {
			$this->icServer->openMailbox($oldMailbox);
		}

		return true;
	}

	/**
	 * get flags for a Message
	 *
	 * @param mixed string _messageUID array of id to retrieve the flags for
	 *
	 * @return null/array flags
	 */
	function getFlags ($_messageUID) {
		try
		{
			$uidsToFetch = new Horde_Imap_Client_Ids();
			if (!(is_object($_messageUID) || is_array($_messageUID))) $_messageUID = (array)$_messageUID;
			$uidsToFetch->add($_messageUID);
			$_folderName = $this->icServer->getCurrentMailbox();
			$fquery = new Horde_Imap_Client_Fetch_Query();
			$fquery->flags();
			$headersNew = $this->icServer->fetch($_folderName, $fquery, array(
				'ids' => $uidsToFetch,
			));
			if (is_object($headersNew)) {
				foreach($headersNew->ids() as $id) {
					$_headerObject = $headersNew->get($id);
					$flags = $_headerObject->getFlags();
				}
			}
		}
		catch (\Exception $e)
		{
			error_log(__METHOD__.' ('.__LINE__.') '."Failed to fetch flags for ".array2string($_messageUID)." Error:".$e->getMessage());
			return null;
			//throw new Exception("Failed to fetch flags for ".array2string($_messageUID)" Error:".$e->getMessage());
		}
		return $flags;
	}

	/**
	 * get and parse the flags response for the Notifyflag for a Message
	 *
	 * @param string _messageUID array of id to retrieve the flags for
	 * @param array flags - to avoid additional server call
	 *
	 * @return null/boolean
	 */
	function getNotifyFlags ($_messageUID, $flags=null)
	{
		if (self::$debug) error_log(__METHOD__.$_messageUID.' Flags:'.array2string($flags));
		try
		{
			if($flags===null) $flags =  $this->getFlags($_messageUID);
		}
		catch (\Exception $e)
		{
			return null;
		}

		if ( stripos( array2string($flags),'MDNSent')!==false)
			return true;

		if ( stripos( array2string($flags),'MDNnotSent')!==false)
			return false;

		return null;
	}

	/**
	 * flag a Message
	 *
	 * @param string _flag (readable name)
	 * @param mixed array/string _messageUID array of ids to flag, or 'all'
	 * @param string _folder foldername
	 *
	 * @todo handle handle icserver->setFlags returnValue
	 *
	 * @return bool true, as we do not handle icserver->setFlags returnValue
	 */
	function flagMessages($_flag, $_messageUID,$_folder=NULL)
	{
		//error_log(__METHOD__.' ('.__LINE__.') '.'->' .$_flag." ".array2string($_messageUID).",$_folder /".$this->sessionData['mailbox']);
		if (empty($_messageUID))
		{
			if (self::$debug) error_log(__METHOD__." no messages Message(s): ".implode(',',$_messageUID));
			return false;
		}
		$this->icServer->openMailbox($_folder ?: $this->sessionData['mailbox']);
		$folder = $this->icServer->getCurrentMailbox();
		if (is_array($_messageUID)&& count($_messageUID)>50)
		{
			$count = $this->getMailBoxCounters($folder,true);
			if ($count->messages == count($_messageUID)) $_messageUID='all';
		}

		if ($_messageUID==='all')
		{
			$messageUIDs = array('all');
		}
		else
		{
			if (!(is_object($_messageUID) || is_array($_messageUID))) $_messageUID = (array)$_messageUID;
			$messageUIDs = array_chunk($_messageUID,50,true);
		}
		try
		{
			foreach($messageUIDs as &$uids)
			{
				if ($uids==='all')
				{
					$uidsToModify=null;
				}
				else
				{
					$uidsToModify = new Horde_Imap_Client_Ids();
					$uidsToModify->add($uids);
				}
				switch($_flag) {
					case "delete":
						$this->icServer->store($folder, array('add'=>array('\\Deleted'), 'ids'=> $uidsToModify));
						break;
					case "undelete":
						$this->icServer->store($folder, array('remove'=>array('\\Deleted'), 'ids'=> $uidsToModify));
						break;
					case "flagged":
						$this->icServer->store($folder, array('add'=>array('\\Flagged'), 'ids'=> $uidsToModify));
						break;
					case "read":
					case "seen":
						$this->icServer->store($folder, array('add'=>array('\\Seen'), 'ids'=> $uidsToModify));
						break;
					case "forwarded":
						$this->icServer->store($folder, array('add'=>array('$Forwarded'), 'ids'=> $uidsToModify));
						//fall through
					case "answered":
						$this->icServer->store($folder, array('add'=>array('\\Answered'), 'ids'=> $uidsToModify));
						break;
					case "unflagged":
						$this->icServer->store($folder, array('remove'=>array('\\Flagged'), 'ids'=> $uidsToModify));
						break;
					case "unread":
					case "unseen":
						$this->icServer->store($folder, array('remove'=>array('\\Seen','\\Answered','$Forwarded'), 'ids'=> $uidsToModify));
						break;
					case "mdnsent":
						$this->icServer->store($folder, array('add'=>array('MDNSent'), 'ids'=> $uidsToModify));
						break;
					case "mdnnotsent":
						$this->icServer->store($folder, array('add'=>array('MDNnotSent'), 'ids'=> $uidsToModify));
						break;
					case "label1":
					case "labelone":
						$this->icServer->store($folder, array('add'=>array('$label1'), 'ids'=> $uidsToModify));
						break;
					case "unlabel1":
					case "unlabelone":
						$this->icServer->store($folder, array('remove'=>array('$label1'), 'ids'=> $uidsToModify));
						break;
					case "label2":
					case "labeltwo":
						$this->icServer->store($folder, array('add'=>array('$label2'), 'ids'=> $uidsToModify));
						break;
					case "unlabel2":
					case "unlabeltwo":
						$this->icServer->store($folder, array('remove'=>array('$label2'), 'ids'=> $uidsToModify));
						break;
					case "label3":
					case "labelthree":
						$this->icServer->store($folder, array('add'=>array('$label3'), 'ids'=> $uidsToModify));
						break;
					case "unlabel3":
					case "unlabelthree":
						$this->icServer->store($folder, array('remove'=>array('$label3'), 'ids'=> $uidsToModify));
						break;
					case "label4":
					case "labelfour":
						$this->icServer->store($folder, array('add'=>array('$label4'), 'ids'=> $uidsToModify));
						break;
					case "unlabel4":
					case "unlabelfour":
						$this->icServer->store($folder, array('remove'=>array('$label4'), 'ids'=> $uidsToModify));
						break;
					case "label5":
					case "labelfive":
						$this->icServer->store($folder, array('add'=>array('$label5'), 'ids'=> $uidsToModify));
						break;
					case "unlabel5":
					case "unlabelfive":
						$this->icServer->store($folder, array('remove'=>array('$label5'), 'ids'=> $uidsToModify));
						break;
					case "unlabel":
						$this->icServer->store($folder, array('remove'=>array('$label1'), 'ids'=> $uidsToModify));
						$this->icServer->store($folder, array('remove'=>array('$label2'), 'ids'=> $uidsToModify));
						$this->icServer->store($folder, array('remove'=>array('$label3'), 'ids'=> $uidsToModify));
						$this->icServer->store($folder, array('remove'=>array('$label4'), 'ids'=> $uidsToModify));
						$this->icServer->store($folder, array('remove'=>array('$label5'), 'ids'=> $uidsToModify));
						break;
				}
			}
		}
		catch(Exception $e)
		{
			error_log(__METHOD__.__LINE__.' Error, could not flag messages in folder '.$folder.' Reason:'.$e->getMessage());
		}
		if ($folder instanceof Horde_Imap_Client_Mailbox) $_folder = $folder->utf8;
		//error_log(__METHOD__.__LINE__.'#'.$this->icServer->ImapServerId.'#'.array2string($_folder).'#');
		if (isset(self::$folderStatusCache[$this->icServer->ImapServerId][($_folder??$this->sessionData['mailbox'])]['uidValidity']))
		{
			self::$folderStatusCache[$this->icServer->ImapServerId][($_folder??$this->sessionData['mailbox'])]['uidValidity'] = 0;
		}

		//error_log(__METHOD__.' ('.__LINE__.') '.'->' .$_flag." ".array2string($_messageUID).",".($_folder?$_folder:$this->sessionData['mailbox']));
		return true; // as we do not catch/examine setFlags returnValue
	}

	/**
	 * move Message(s)
	 *
	 * @param string _foldername target folder
	 * @param mixed array/string _messageUID array of ids to flag, or 'all'
	 * @param boolean $deleteAfterMove - decides if a mail is moved (true) or copied (false)
	 * @param string $currentFolder
	 * @param boolean $returnUIDs - control wether or not the action called should return the new uids
	 *						caveat: not all servers do support that
	 * @param int $_sourceProfileID - source profile ID, should be handed over, if not $this->icServer->ImapServerId is used
	 * @param int $_targetProfileID - target profile ID, should only be handed over when target server is different from source
	 *
	 * @return mixed/bool true,false or new uid
	 * @throws Exception
	 */
	function moveMessages($_foldername, $_messageUID, $deleteAfterMove=true, $currentFolder = Null, $returnUIDs = false, $_sourceProfileID = Null, $_targetProfileID = Null)
	{
		$source = Mail\Account::read(($_sourceProfileID?$_sourceProfileID:$this->icServer->ImapServerId))->imapServer();
		//$deleteOptions  = $GLOBALS['egw_info']["user"]["preferences"]["mail"]["deleteOptions"];
		if (empty($_messageUID))
		{
			if (self::$debug) error_log(__METHOD__." no Message(s): ".implode(',',$_messageUID));
			return false;
		}
		elseif ($_messageUID==='all')
		{
			//error_log(__METHOD__." all Message(s): ".implode(',',$_messageUID));
			$uidsToMove= null;
		}
		else
		{
			//error_log(__METHOD__." Message(s): ".implode(',',$_messageUID));
			$uidsToMove = new Horde_Imap_Client_Ids();
			if (!(is_object($_messageUID) || is_array($_messageUID))) $_messageUID = (array)$_messageUID;
			$uidsToMove->add($_messageUID);
		}
		$sourceFolder = (!empty($currentFolder)?$currentFolder: $this->sessionData['mailbox']);
		//error_log(__METHOD__.__LINE__."$_targetProfileID !== ".array2string($source->ImapServerId));
		if (isset($_targetProfileID) && $_targetProfileID !== $source->ImapServerId)
		{
			$sourceFolder = $source->getMailbox($sourceFolder);
			$source->openMailbox($sourceFolder);
			$uidsToFetch = new Horde_Imap_Client_Ids();
			$uidsToFetch->add($_messageUID);
			$fquery = new Horde_Imap_Client_Fetch_Query();
			$fquery->flags();
			$fquery->headerText(array('peek'=>true));
			$fquery->fullText(array('peek'=>true));
			$fquery->imapDate();
			$headersNew = $source->fetch($sourceFolder, $fquery, array(
				'ids' => $uidsToFetch,
			));

			//error_log(__METHOD__.' ('.__LINE__.') '.' Sourceserver:'.$source->ImapServerId.' mailheaders:'.array2string($headersNew));

			if (is_object($headersNew)) {
				$c=0;
				$retUid = new Horde_Imap_Client_Ids();
				// we copy chunks of 5 to avoid too much memory and/or server stress
				// some servers seem not to allow/support the appendig of multiple messages. so we are down to one
				foreach($headersNew as &$_headerObject) {
					$c++;
					$flags = $_headerObject->getFlags(); //unseen status seems to be lost when retrieving the full message
					$date = $_headerObject->getImapDate();
					$currentDate =  new Horde_Imap_Client_DateTime();
					// if the internal Date of the message equals the current date; try using the header date
					if ($date==$currentDate)
					{
						$headerForPrio = array_change_key_case($_headerObject->getHeaderText(0,Horde_Imap_Client_Data_Fetch::HEADER_PARSE)->toArray(), CASE_UPPER);
						//error_log(__METHOD__.__LINE__.'#'.array2string($date).'#'.array2string($currentDate).'#'.$headerForPrio['DATE']);
						$date = new Horde_Imap_Client_DateTime($headerForPrio['DATE']);
						//error_log(__METHOD__.__LINE__.'#'.array2string($date).'#'.array2string($currentDate).'#');
					}
					//error_log(__METHOD__.' ('.__LINE__.') '.array2string($_headerObject)));
					//error_log(__METHOD__.' ('.__LINE__.') '.array2string($flags));
					$body = $_headerObject->getFullMsg();
					$dataNflags[] = array('data'=>$body, 'flags'=>$flags, 'internaldate'=>$date);
					if ($c==1)
					{
						$target = Mail\Account::read($_targetProfileID)->imapServer();
						//error_log(__METHOD__.' ('.__LINE__.') '.' Sourceserver:'.$source->ImapServerId.' TargetServer:'.$_targetProfileID.' TargetFolderObject:'.array2string($_foldername));
						$foldername = $target->getMailbox($_foldername);
						// make sure the target folder is open and ready
						$target->openMailbox($foldername);
						$ret = $target->append($foldername,$dataNflags);
						$retUid->add($ret);
						unset($dataNflags);
						// sleep 500 miliseconds; AS some sERVERs seem not to be capable of the load this is
						// inflicting in them. they "reply" with an unspecific IMAP Error
						time_nanosleep(0,500000);
						$c=0;
					}
				}
				if (isset($dataNflags))
				{
					$target = Mail\Account::read($_targetProfileID)->imapServer();
					//error_log(__METHOD__.' ('.__LINE__.') '.' Sourceserver:'.$source->ImapServerId.' TargetServer:'.$_targetProfileID.' TargetFolderObject:'.array2string($foldername));
					$foldername = $target->getMailbox($_foldername);
					// make sure the target folder is open and ready
					$target->openMailbox($foldername);
					$ret = $target->append($foldername,$dataNflags);
					$retUid->add($ret);
					unset($dataNflags);
				}
				//error_log(__METHOD__.' ('.__LINE__.') '.array2string($retUid));
				// make sure we are back to source
				$source->openMailbox($sourceFolder);
				if ($deleteAfterMove)
				{
					$remember = $this->icServer;
					$this->icServer = $source;
					$this->deleteMessages($_messageUID, $sourceFolder, $_forceDeleteMethod='remove_immediately');
					$this->icServer = $remember;
				}
			}
		}
		else
		{
			try
			{
				$retUid = $source->copy($sourceFolder, $_foldername, array('ids'=>$uidsToMove,'move'=>$deleteAfterMove));
			}
			catch (exception $e)
			{
				error_log(__METHOD__.' ('.__LINE__.') '."Copying to Folder $_foldername failed! Error:".$e->getMessage());
				throw new Exception("Copying to Folder $_foldername failed! Error:".$e->getMessage());
			}
		}

		//error_log(__METHOD__.' ('.__LINE__.') '.array2string($retUid));
		return ($returnUIDs ? $retUid : true);
	}

	/**
	 * Parse dates, also handle wrong or unrecognized timezones, falling back to current time
	 *
	 * @param string $_date to be parsed/formatted
	 * @param string $format ='' if none is passed, use user prefs
	 * @return string returns the date as it is parseable by strtotime, or current timestamp if everything fails
	 */
	static function _strtotime($_date='', $format='', $convert2usertime=false)
	{
		try {
			$date = new DateTime($_date);	// parse date & time including timezone (throws exception, if not parsable)
			if ($convert2usertime) $date->setUser();	// convert to user-time
			$date2return = $date->format($format);
		}
		catch(\Exception $e)
		{
			unset($e);	// not used

			// remove last space-separated part and retry
			$parts = explode(' ',$_date);
			// try only 10 times to prevent of causing error by reaching
			// maximum function nesting level.
			if (count($parts) > 1 && count($parts)<10)
			{
				array_pop($parts);
				$date2return = self::_strtotime(implode(' ', $parts), $format, $convert2usertime);
			}
			else	// not last part, use current time
			{
				$date2return = DateTime::to('now', $format);
			}
		}
		return $date2return;
	}

	/**
	 * htmlentities
	 * helperfunction to cope with wrong encoding in strings
	 * @param string $_string  input to be converted
	 * @param mixed $_charset false or string -> Target charset, if false Mail displayCharset will be used
	 * @return string
	 */
	static function htmlentities($_string, $_charset=false)
	{
		//setting the charset (if not given)
		if ($_charset===false) $_charset = self::$displayCharset;
		$string = @htmlentities($_string, ENT_QUOTES, $_charset, false);
		if (empty($string) && !empty($_string)) $string = @htmlentities(Translation::convert($_string,Translation::detect_encoding($_string),$_charset),ENT_QUOTES | ENT_IGNORE,$_charset, false);
		return $string;
	}

	/**
	 * clean a message from elements regarded as potentially harmful
	 * param string/reference $_html is the text to be processed
	 * return nothing
	 */
	static function getCleanHTML(&$_html)
	{
		// remove CRLF and TAB as it is of no use in HTML.
		// but they matter in <pre>, so we rather don't
		//$_html = str_replace("\r\n",' ',$_html);
		//$_html = str_replace("\t",' ',$_html);
		//error_log(__METHOD__.__LINE__.':'.$_html);
		//repair doubleencoded ampersands, and some stuff htmLawed stumbles upon with balancing switched on
		$_html = str_replace(array('&amp;amp;','<DIV><BR></DIV>',"<DIV>&nbsp;</DIV>",'<div>&nbsp;</div>','</td></font>','<br><td>','<tr></tr>','<o:p></o:p>','<o:p>','</o:p>'),
							 array('&amp;',    '<BR>',           '<BR>',             '<BR>',             '</font></td>','<td>',    '',         '',           '',  ''),$_html);
		//$_html = str_replace(array('&amp;amp;'),array('&amp;'),$_html);
		if (stripos($_html,'style')!==false) Mail\Html::replaceTagsCompletley($_html,'style'); // clean out empty or pagewide style definitions / left over tags
		if (stripos($_html,'head')!==false) Mail\Html::replaceTagsCompletley($_html,'head'); // Strip out stuff in head
		//if (stripos($_html,'![if')!==false && stripos($_html,'<![endif]>')!==false) Mail\Html::replaceTagsCompletley($_html,'!\[if','<!\[endif\]>',false); // Strip out stuff in ifs
		//if (stripos($_html,'!--[if')!==false && stripos($_html,'<![endif]-->')!==false) Mail\Html::replaceTagsCompletley($_html,'!--\[if','<!\[endif\]-->',false); // Strip out stuff in ifs
		//error_log(__METHOD__.' ('.__LINE__.') '.$_html);

		if (function_exists('get_magic_quotes_gpc') && get_magic_quotes_gpc() === 1) $_html = stripslashes($_html);
		// Strip out doctype in head, as htmlLawed cannot handle it TODO: Consider extracting it and adding it afterwards
		if (stripos($_html,'!doctype')!==false) Mail\Html::replaceTagsCompletley($_html,'!doctype');
		if (stripos($_html,'?xml:namespace')!==false) Mail\Html::replaceTagsCompletley($_html,'\?xml:namespace','/>',false);
		if (stripos($_html,'?xml version')!==false) Mail\Html::replaceTagsCompletley($_html,'\?xml version','\?>',false);
		if (strpos($_html,'!CURSOR')!==false) Mail\Html::replaceTagsCompletley($_html,'!CURSOR');
		// htmLawed filter only the 'body'
		//preg_match('`(<htm.+?<body[^>]*>)(.+?)(</body>.*?</html>)`ims', $_html, $matches);
		//if ($matches[2])
		//{
		//	$hasOther = true;
		//	$_html = $matches[2];
		//}
		// purify got switched to htmLawed
		// some testcode to test purifying / htmlawed
		//$_html = "<BLOCKQUOTE>hi <div> there </div> kram <br> </blockquote>".$_html;
		$_html = Html\HtmLawed::purify($_html,self::$htmLawed_config,array(),true);
		//if ($hasOther) $_html = $matches[1]. $_html. $matches[3];
		// clean out comments , should not be needed as purify should do the job.
		$search = array(
			'@url\(http:\/\/[^\)].*?\)@si',  // url calls e.g. in style definitions
			'@<!--[\s\S]*?[ \t\n\r]*-->@',         // Strip multi-line comments including CDATA
		);
		$_html = preg_replace($search,"",$_html);
		// remove non printable chars
		$_html = preg_replace('/([\000-\011])/','',$_html);
		//error_log(__METHOD__.':'.__LINE__.':'.$_html);
	}

	/**
	 * Header and Bodystructure stuff
	 */

	/**
	 * getMimePartCharset - fetches the charset mimepart if it exists
	 * @param $_mimePartObject structure object
	 * @return mixed mimepart or false if no CHARSET is found, the missing charset has to be handled somewhere else,
	 *		as we cannot safely assume any charset as we did earlier
	 */
	function getMimePartCharset($_mimePartObject)
	{
		//$charSet = 'iso-8859-1';//self::$displayCharset; //'iso-8859-1'; // self::displayCharset seems to be asmarter fallback than iso-8859-1
		$CharsetFound=false;
		//echo "#".$_mimePartObject->encoding.'#<br>';
		if(is_array($_mimePartObject->parameters)) {
			if(isset($_mimePartObject->parameters['CHARSET'])) {
				$charSet = $_mimePartObject->parameters['CHARSET'];
				$CharsetFound=true;
			}
		}
		// this one is dirty, but until I find something that does the trick of detecting the encoding, ....
		//if ($CharsetFound == false && $_mimePartObject->encoding == "QUOTED-PRINTABLE") $charSet = 'iso-8859-1'; //assume quoted-printable to be ISO
		//if ($CharsetFound == false && $_mimePartObject->encoding == "BASE64") $charSet = 'utf-8'; // assume BASE64 to be UTF8
		return ($CharsetFound ? $charSet : $CharsetFound);
	}

	/**
	 * decodeMimePart - fetches the charset mimepart if it exists
	 * @param string $_mimeMessage - the message to be decoded
	 * @param string $_encoding - the encoding used BASE64 and QUOTED-PRINTABLE is supported
	 * @param string $_charset - not used
	 * @return string decoded mimePart
	 */
	function decodeMimePart($_mimeMessage, $_encoding, $_charset = '')
	{
		// decode the part
		if (self::$debug) error_log(__METHOD__."() with $_encoding and $_charset:".print_r($_mimeMessage,true));
		switch (strtoupper($_encoding))
		{
			case 'BASE64':
				// use imap_base64 to decode, not any longer, as it is strict, and fails if it encounters invalid chars
				return base64_decode($_mimeMessage);

			case 'QUOTED-PRINTABLE':
				// use imap_qprint to decode
				return quoted_printable_decode($_mimeMessage);

			case 'WEDONTKNOWTHEENCODING':
				// try base64
				$r = base64_decode($_mimeMessage);
				if (json_encode($r))
				{
					return $r;
				}
				//we do not know the encoding, so we do not decode
			default:
				// it is either not encoded or we don't know about it
				return $_mimeMessage;
		}
	}

	/**
	 * get part of the message, if its stucture is indicating its of multipart alternative style
	 * a wrapper for multipartmixed
	 * @param string/int $_uid the messageuid,
	 * @param Horde_Mime_Part $_structure structure for parsing
	 * @param string $_htmlMode how to display a message, html, plain text, ...
	 * @param boolean $_preserveSeen flag to preserve the seenflag by using body.peek
	 * @param Horde_Mime_Part& $partCalendar =null on return text/calendar part, if one was contained or false
	 * @return array containing the desired part
	 */
	function getMultipartAlternative($_uid, Horde_Mime_Part $_structure, $_htmlMode, $_preserveSeen = false, &$partCalendar=null)
	{
		// a multipart/alternative has exactly 2 parts (text and html  OR  text and something else)
		// sometimes there are 3 parts, when there is an ics/ical attached/included-> we want to show that
		// as attachment AND as abstracted ical information (we use our notification style here).
		$partText = $partCalendar = $partHTML = null;
		if (self::$debug) _debug_array(array("METHOD"=>__METHOD__,"LINE"=>__LINE__,"STRUCTURE"=>$_structure));
		//error_log(__METHOD__.' ('.__LINE__.') ');
		$ignore_first_part = true;
		foreach($_structure->contentTypeMap() as $mime_id => $mime_type)
		{
			//error_log(__METHOD__."($_uid, ".$_structure->getMimeId().") $mime_id: $mime_type"." ignoreFirstPart:".$ignore_first_part);
			if (self::$debug) echo __METHOD__."($_uid, partID=".$_structure->getMimeId().") $mime_id: $mime_type<br>";

			if ($ignore_first_part)
			{
				$ignore_first_part = false;
				continue;	// ignore multipart/alternative itself
			}

			$mimePart = $_structure->getPart($mime_id);

			switch($mimePart->getPrimaryType())
			{
				case 'text':
					switch($mimePart->getSubType())
					{
						case 'plain':
							if ($mimePart->getBytes() > 0) $partText = $mimePart;
							break;

						case 'html':
							if ($mimePart->getBytes() > 0)  $partHTML = $mimePart;
							break;

						case 'calendar':
							if ($mimePart->getBytes() > 0)  $partCalendar = $mimePart;
							break;
					}
					break;

				case 'multipart':
					switch($mimePart->getSubType())
					{
						case 'related':
						case 'mixed':
							if (count($mimePart->getParts()) > 1)
							{
								// in a multipart alternative we treat the multipart/related as html part
								if (self::$debug) error_log(__METHOD__." process MULTIPART/".$mimePart->getSubType()." with array as subparts");
								$partHTML = $mimePart;
								break 3; // GET OUT OF LOOP, will be processed according to type
							}
							break;
						case 'alternative':
							if (count($mimePart->getParts()) > 1)
							{
								//cascading multipartAlternative structure, assuming only the first one is to be used
								return $this->getMultipartAlternative($_uid, $mimePart, $_htmlMode, $_preserveSeen);
							}
					}
			}
		}

		switch($_htmlMode)
		{
			case 'html_only':
			case 'always_display':
				if ($partHTML)
				{
					switch($partHTML->getSubType())
					{
						case 'related':
							return $this->getMultipartRelated($_uid, $partHTML, $_htmlMode, $_preserveSeen);

						case 'mixed':
							return $this->getMultipartMixed($_uid, $partHTML, $_htmlMode, $_preserveSeen);

						default:
							return $this->getTextPart($_uid, $partHTML, $_htmlMode, $_preserveSeen);
					}
				}
				elseif ($partText && $_htmlMode=='always_display')
				{
					return $this->getTextPart($_uid, $partText, $_htmlMode, $_preserveSeen);
				}
				break;

			case 'only_if_no_text':
				if ($partText)
				{
					return $this->getTextPart($_uid, $partText, $_htmlMode, $_preserveSeen);
				}
				if ($partHTML)
				{
					if ($partHTML->getPrimaryType())
					{
						return $this->getMultipartRelated($_uid, $partHTML, $_htmlMode, $_preserveSeen);
					}
					return $this->getTextPart($_uid, $partHTML, 'always_display', $_preserveSeen);
				}
				break;

			default:
				if ($partText)
				{
					return $this->getTextPart($_uid, $partText, $_htmlMode, $_preserveSeen);
				}
				$bodyPart = array(
					'body'		=> lang("no plain text part found"),
					'mimeType'	=> 'text/plain',
					'charSet'	=> self::$displayCharset,
				);
				break;
		}
		return $bodyPart;
	}

	/**
	 * Get part of the message, if its stucture is indicating its of multipart mixed style
	 *
	 * @param int $_uid the messageuid,
	 * @param Horde_Mime_Part $_structure = '' if given use structure for parsing
	 * @param string $_htmlMode how to display a message, html, plain text, ...
	 * @param boolean $_preserveSeen flag to preserve the seenflag by using body.peek
	 * @param array& $skipParts - passed by reference to have control/knowledge which parts are already fetched
	 * @param Horde_Mime_Part& $partCalendar =null on return text/calendar part, if one was contained or false
	 * @return array containing the desired part
	 */
	function getMultipartMixed($_uid, Horde_Mime_Part $_structure, $_htmlMode, $_preserveSeen = false, &$skipParts=array(), &$partCalendar=null)
	{
		if (self::$debug) echo __METHOD__."$_uid, $_htmlMode<br>";
		$bodyPart = array();
		if (self::$debug) _debug_array($_structure);

		$ignore_first_part = true;
		//$skipParts = array();
		//error_log(__METHOD__.__LINE__.array2string($_structure->contentTypeMap()));
		foreach($_structure->contentTypeMap() as $mime_id => $mime_type)
		{
			//error_log(__METHOD__."($_uid, ".$_structure->getMimeId().") $mime_id: $mime_type");
			if (self::$debug) echo __METHOD__."($_uid, partID=".$_structure->getMimeId().") $mime_id: $mime_type<br>";
			if ($ignore_first_part)
			{
				$ignore_first_part = false;
				//error_log(__METHOD__."($_uid, ".$_structure->getMimeId().") SKIPPED FirstPart $mime_id: $mime_type");
				continue;	// ignore multipart/mixed itself
			}
			if (array_key_exists($mime_id,$skipParts))
			{
				//error_log(__METHOD__."($_uid, ".$_structure->getMimeId().") SKIPPED $mime_id: $mime_type");
				continue;
			}

			$part = $_structure->getPart($mime_id);

			switch($part->getPrimaryType())
			{
				case 'multipart':
					if ($part->getDisposition() == 'attachment') continue 2;	// +1 for switch
					switch($part->getSubType())
					{
						case 'alternative':
							return array($this->getMultipartAlternative($_uid, $part, $_htmlMode, $_preserveSeen, $partCalendar));

						case 'mixed':
						case 'signed':
							$bodyPart = array_merge($bodyPart, $this->getMultipartMixed($_uid, $part, $_htmlMode, $_preserveSeen, $skipParts, $partCalendar));
							break;

						case 'related':
							$bodyPart = array_merge($bodyPart, $this->getMultipartRelated($_uid, $part, $_htmlMode, $_preserveSeen, $partCalendar, $skipParts));
							break;
					}
					break;
				case 'application':
					switch($part->getSubType())
					{
						case 'pgp-encrypted':
							if (($part = $_structure->getPart($mime_id+1)) &&
								$part->getType() == 'application/octet-stream')
							{
								$this->fetchPartContents($_uid, $part);
								$skipParts[$mime_id]=$mime_type;
								$skipParts[$mime_id+1]=$part->getType();
								$bodyPart[] = array(
									'body'		=> $part->getContents(array(
										'stream' => false,
									)),
									'mimeType'  => 'text/plain',
									'charSet'	=> $_structure->getCharset(),
								);
							}
							break;
					}
					break;

				case 'text':
					switch($part->getSubType())
					{
						case 'plain':
						case 'html':
						case 'calendar': // inline ics/ical files
							if($part->getDisposition() != 'attachment')
							{
								$bodyPart[] = $this->getTextPart($_uid, $part, $_htmlMode, $_preserveSeen);
								$skipParts[$mime_id]=$mime_type;
							}
							//error_log(__METHOD__.' ('.__LINE__.') '.' ->'.$part->type."/".$part->subType.' -> BodyPart:'.array2string($bodyPart[count($bodyPart)-1]));
							break;
					}
					break;

				case 'message':
					//skip attachments
					if($part->getSubType() == 'delivery-status' && $part->getDisposition() != 'attachment')
					{
						$bodyPart[] = $this->getTextPart($_uid, $part, $_htmlMode, $_preserveSeen);
						$skipParts[$mime_id]=$mime_type;
					}
					// do not descend into attached Messages
					if($part->getSubType() == 'rfc822' || $part->getDisposition() == 'attachment')
					{
						$skipParts[$mime_id.'.0'] = $mime_type;
						foreach($part->contentTypeMap() as $sub_id => $sub_type){ $skipParts[$sub_id] = $sub_type;}
						//error_log(__METHOD__.' ('.__LINE__.') '.' Uid:'.$_uid.' Part:'.$mime_id.':'.array2string($skipParts));
						//break 2;
					}
					break;

				default:
					// do nothing
					// the part is a attachment
			}
		}
		return $bodyPart;
	}

	/**
	 * getMultipartRelated
	 * get part of the message, if its stucture is indicating its of multipart related style
	 * a wrapper for multipartmixed
	 * @param string/int $_uid the messageuid,
	 * @param Horde_Mime_Part $_structure if given use structure for parsing
	 * @param string $_htmlMode how to display a message, html, plain text, ...
	 * @param boolean $_preserveSeen flag to preserve the seenflag by using body.peek
	 * @param Horde_Mime_Part& $partCalendar =null on return text/calendar part, if one was contained or false
	 * @param array& $skipParts - passed by reference to have control/knowledge which parts are already fetched
	 * @return array containing the desired part
	 */
	function getMultipartRelated($_uid, Horde_Mime_Part $_structure, $_htmlMode, $_preserveSeen=false, &$partCalendar=null, &$skipParts=array())
	{
		return $this->getMultipartMixed($_uid, $_structure, $_htmlMode, $_preserveSeen, $skipParts, $partCalendar);
	}

	/**
	 * Fetch a body part
	 *
	 * @param int $_uid
	 * @param string $_partID = null
	 * @param string $_folder = null
	 * @param boolean $_preserveSeen = false
	 * @param boolean $_stream = false true return a stream, false return string
	 * @param string &$_encoding = null on return: transfer encoding of returned part
	 * @param boolean $_tryDecodingServerside = true; wether to try to fetch Data with BINARY instead of BODY
	 * @return string|resource
	 */
	function getBodyPart($_uid, $_partID=null, $_folder=null, $_preserveSeen=false, $_stream=false, &$_encoding=null, $_tryDecodingServerside=true)
	{
		if (self::$debug) error_log( __METHOD__.__LINE__."(".array2string($_uid).", $_partID, $_folder, $_preserveSeen, $_stream, $_encoding, $_tryDecodingServerside)");

		if (empty($_folder))
		{
			$_folder = $this->sessionData['mailbox'] ?? $this->icServer->getCurrentMailbox();
		}
		//error_log(__METHOD__.' ('.__LINE__.') '.array2string($_folder).'/'.$this->icServer->getCurrentMailbox().'/'. $this->sessionData['mailbox']);
		// querying contents of body part
		$uidsToFetch = new Horde_Imap_Client_Ids();
		if (!(is_object($_uid) || is_array($_uid))) $_uid = (array)$_uid;
		$uidsToFetch->add($_uid);

		$fquery = new Horde_Imap_Client_Fetch_Query();
		$fetchParams = array(
			'peek' => $_preserveSeen,
			'decode' => true,	// try decode on server, does NOT neccessary work
		);
		if ($_tryDecodingServerside===false)// || ($_tryDecodingServerside&&$this->isDraftFolder($_folder)))
		{
			$_tryDecodingServerside=false;
			$fetchParams = array(
				'peek' => $_preserveSeen,
			);
		}
		$fquery->bodyPart($_partID, $fetchParams);

		$part = $this->icServer->fetch($_folder, $fquery, array(
			'ids' => $uidsToFetch,
		))->first();
		$partToReturn = null;
		if ($part)
		{
			$_encoding = $part->getBodyPartDecode($_partID);
			//error_log(__METHOD__.__LINE__.':'.$_encoding.'#');
			$partToReturn = $part->getBodyPart($_partID, $_stream);
			//error_log(__METHOD__.__LINE__.':'.$partToReturn.'#');
		}
		// if we get an empty result, server may have trouble fetching data with UID FETCH $_uid (BINARY.PEEK[$_partID])
		// thus we trigger a second go with UID FETCH $_uid (BODY.PEEK[$_partID])
		if (empty($partToReturn)&&$_tryDecodingServerside===true)
		{
			error_log(__METHOD__.__LINE__.' failed to fetch bodyPart in  BINARY. Try BODY');
			$partToReturn = $this->getBodyPart($_uid, $_partID, $_folder, $_preserveSeen, $_stream, $_encoding, false);
		}
		return ($partToReturn?$partToReturn:null);
	}

	/**
	 * Get Body from message
	 *
	 * @param int $_uid the messageuid
	 * @param Horde_Mime_Part $_structure = null if given use structure for parsing
	 * @param string $_htmlMode how to display a message: 'html_only', 'always_display', 'only_if_no_text' or ''
	 * @param boolean $_preserveSeen flag to preserve the seenflag by using body.peek
	 * @param boolean $_stream = false true return a stream, false return string
	 * @return array containing the desired text part, mimeType and charset
	 */
	function getTextPart($_uid, Horde_Mime_Part $_structure, $_htmlMode='', $_preserveSeen=false, $_stream=false)
	{
		//error_log(__METHOD__.' ('.__LINE__.') '.'->'.$_uid.':'.array2string($_structure).' '.function_backtrace());
		$bodyPart = array();
		if (self::$debug) _debug_array(array($_structure,function_backtrace()));

		if($_structure->getSubType() == 'html' && !in_array($_htmlMode, array('html_only', 'always_display', 'only_if_no_text')))
		{
			$bodyPart = array(
				'error'		=> 1,
				'body'		=> lang("displaying html messages is disabled"),
				'mimeType'	=> 'text/html',
				'charSet'	=> self::$displayCharset,
			);
		}
		elseif ($_structure->getSubType() == 'plain' && $_htmlMode == 'html_only')
		{
			$bodyPart = array(
				'error'		=> 1,
				'body'      => lang("displaying plain messages is disabled"),
				'mimeType'  => 'text/plain', // make sure we do not return mimeType text/html
				'charSet'   => self::$displayCharset,
			);
		}
		else
		{
			// some Servers append PropertyFile___ ; strip that here for display
			// RB: not sure what this is: preg_replace('/PropertyFile___$/','',$this->decodeMimePart($mimePartBody, $_structure->encoding, $this->getMimePartCharset($_structure))),

			// Should not try to fetch if the content is already there (e.g. Smime encrypted message)
			if (empty($_structure->getContents())) $this->fetchPartContents($_uid, $_structure, $_stream, $_preserveSeen);

			$bodyPart = array(
				'body'		=> $_structure->getContents(array(
					'stream' => $_stream,
				)),
				'mimeType'  => $_structure->getType() == 'text/html' ? 'text/html' : 'text/plain',
				'charSet'	=> $_structure->getCharset(),
			);
		}
		return $bodyPart;
	}

	/**
	 * Get Body of message
	 *
	 * @param int $_uid the messageuid,
	 * @param string $_htmlOptions how to display a message, html, plain text, ...
	 * @param string $_partID = null the partID, may be omitted
	 * @param Horde_Mime_Part $_structure = null if given use structure for parsing
	 * @param boolean $_preserveSeen flag to preserve the seenflag by using body.peek
	 * @param string $_folder folder to work on
	 * @param Horde_Mime_part& $calendar_part =null on return calendar-part or null, if there is none
	 * @return array containing the message body, mimeType and charset
	 */
	function getMessageBody($_uid, $_htmlOptions='', $_partID=null, Horde_Mime_Part $_structure=null, $_preserveSeen = false, $_folder = '', &$calendar_part=null)
	{
		if (self::$debug) echo __METHOD__."$_uid, $_htmlOptions, $_partID<br>";
		if($_htmlOptions != '') {
			$this->htmlOptions = $_htmlOptions;
		}
		if (empty($_folder))
		{
			$_folder = $this->sessionData['mailbox'] ?? null;
		}
		if (empty($this->sessionData['mailbox']) && !empty($_folder))
		{
			$this->sessionData['mailbox'] = $_folder;
		}

		if (!isset($_structure))
		{
			$_structure = $this->getStructure($_uid, $_partID, $_folder, $_preserveSeen);
		}
		if (!is_object($_structure))
		{
			return array(
				array(
					'error'		=> 1,
					'body'		=> 'Error: Could not fetch structure on mail:'.$_uid." as $_htmlOptions". 'for Mailprofile'.$this->icServer->ImapServerId.' User:'.$GLOBALS['egw_info']['user']['account_lid'],
					'mimeType'	=> 'text/plain',
					'charSet'	=> self::$displayCharset,
				)
			);
		}
		if (!empty($_partID))
		{
			$_structure->contentTypeMap();
			$_structure = $_structure->getPart($_partID);
			//_debug_array($_structure->getMimeId()); exit;
		}

		switch($_structure->getPrimaryType())
		{
			case 'application':
				return array(
					array(
						'body'		=> '',
						'mimeType'	=> 'text/plain',
						'charSet'	=> 'iso-8859-1',
					)
				);

			case 'multipart':
				switch($_structure->getSubType())
				{
					case 'alternative':
						$bodyParts = array($this->getMultipartAlternative($_uid, $_structure, $this->htmlOptions, $_preserveSeen, $calendar_part));
						break;

					case 'nil': // multipart with no Alternative
					case 'mixed':
					case 'report':
					case 'signed':
					case 'encrypted':
						$skipParts = array();
						$bodyParts = $this->getMultipartMixed($_uid, $_structure, $this->htmlOptions, $_preserveSeen, $skipParts, $calendar_part);
						break;

					case 'related':
						$bodyParts = $this->getMultipartRelated($_uid, $_structure, $this->htmlOptions, $_preserveSeen, $calendar_part);
						break;
				}
				return self::normalizeBodyParts($bodyParts);

			case 'video':
			case 'audio': // some servers send audiofiles and imagesfiles directly, without any stuff surround it
			case 'image': // they are displayed as Attachment NOT INLINE
				return array(
					array(
						'body'      => '',
						'mimeType'  => $_structure->getSubType(),
					),
				);

			case 'text':
				$bodyPart = array();
				if ($_structure->getDisposition() != 'attachment')
				{
					switch($_structure->getSubType())
					{
						case 'calendar':
							$calendar_part = $_structure;
							// fall through in case user has no calendar rights
						case 'html':
						case 'plain':
						default:
							$bodyPart = array($this->getTextPart($_uid, $_structure, $this->htmlOptions, $_preserveSeen));
					}
				} else {
					// what if the structure->disposition is attachment ,...
				}
				return self::normalizeBodyParts($bodyPart);

			case 'attachment':
			case 'message':
				switch($_structure->getSubType())
				{
					case 'rfc822':
						$newStructure = $_structure->getParts();
						if (self::$debug) {echo __METHOD__." Message -> RFC -> NewStructure:"; _debug_array($newStructure[0]);}
						return self::normalizeBodyParts($this->getMessageBody($_uid, $_htmlOptions, $newStructure[0]->getMimeId(), $newStructure[0], $_preserveSeen, $_folder));
				}
				break;

			default:
				if (self::$debug) _debug_array($_structure);
				return array(
					array(
						'body'		=> lang('The mimeparser can not parse this message.').$_structure->getType(),
						'mimeType'	=> 'text/plain',
						'charSet'	=> self::$displayCharset,
					)
				);
		}
	}

	/**
	 * normalizeBodyParts - function to gather and normalize all body Information
	 * as we may recieve a bodyParts structure from within getMessageBody nested deeper than expected
	 * so this is used to normalize the output, so we are able to rely on our expectation
	 * @param _bodyParts - Body Array
	 * @return array - a normalized Bodyarray
	 */
	static function normalizeBodyParts($_bodyParts)
	{
		if (is_array($_bodyParts))
		{
			foreach($_bodyParts as $singleBodyPart)
			{
				if (!isset($singleBodyPart['body'])) {
					$buff = self::normalizeBodyParts($singleBodyPart);
					foreach ((array)$buff as $val) { $body2return[] = $val;}
					continue;
				}
				$body2return[] = $singleBodyPart;
			}
		}
		else
		{
			$body2return = $_bodyParts;
		}
		return $body2return;
	}

	/**
	 * getdisplayableBody - creates the bodypart of the email as textual representation
	 * @param object $mailClass the mailClass object to be used
	 * @param array $bodyParts  with the bodyparts
	 * @param boolean $preserveHTML  switch to preserve HTML
	 * @param boolean $useTidy  switch to use tidy
	 * @return string a preformatted string with the mails converted to text
	 */
	static function &getdisplayableBody(&$mailClass, $bodyParts, $preserveHTML = false,  $useTidy = true)
	{
		$message='';
		for($i=0, $cnt=count($bodyParts ?? []); $i < $cnt; $i++)
		{
			if (!isset($bodyParts[$i]['body'])) {
				$bodyParts[$i]['body'] = self::getdisplayableBody($mailClass, $bodyParts[$i], $preserveHTML, $useTidy);
				$message .= empty($bodyParts[$i]['body'])?'':$bodyParts[$i]['body'];
				continue;
			}
			if (isset($bodyParts[$i]['error'])) continue;
			if (empty($bodyParts[$i]['body'])) continue;
			// some characterreplacements, as they fail to translate
			$sar = array(
				'@(\x84|\x93|\x94)@',
				'@(\x96|\x97|\x1a)@',
				'@(\x82|\x91|\x92)@',
				'@(\x85)@',
				'@(\x86)@',
				'@(\x99)@',
				'@(\xae)@',
			);
			$rar = array(
				'"',
				'-',
				'\'',
				'...',
				'&',
				'(TM)',
				'(R)',
			);

			if(($bodyParts[$i]['mimeType'] == 'text/html' || $bodyParts[$i]['mimeType'] == 'text/plain') &&
				strtoupper($bodyParts[$i]['charSet']) != 'UTF-8')
			{
				$bodyParts[$i]['body'] = preg_replace($sar,$rar,$bodyParts[$i]['body']);
			}

			if ($bodyParts[$i]['charSet']===false) $bodyParts[$i]['charSet'] = Translation::detect_encoding($bodyParts[$i]['body']);
			// add line breaks to $bodyParts
			//error_log(__METHOD__.' ('.__LINE__.') '.' Charset:'.$bodyParts[$i]['charSet'].'->'.$bodyParts[$i]['body']);
			$newBody  = Translation::convert_jsonsafe($bodyParts[$i]['body'], $bodyParts[$i]['charSet']);
			//error_log(__METHOD__.' ('.__LINE__.') '.' MimeType:'.$bodyParts[$i]['mimeType'].'->'.$newBody);
			$mailClass->activeMimeType = 'text/plain';
			if ($bodyParts[$i]['mimeType'] == 'text/html') {
				$mailClass->activeMimeType = $bodyParts[$i]['mimeType'];
				if (!$preserveHTML)
				{
					$alreadyHtmlLawed=false;
					// as Translation::convert reduces \r\n to \n and purifier eats \n -> peplace it with a single space
					$newBody = str_replace("\n"," ",$newBody);
					// convert HTML to text, as we dont want HTML in infologs
					if ($useTidy && extension_loaded('tidy'))
					{
						$tidy = new tidy();
						$cleaned = $tidy->repairString($newBody, self::$tidy_config,'utf8');
						// Found errors. Strip it all so there's some output
						if($tidy->getStatus() == 2)
						{
							error_log(__METHOD__.' ('.__LINE__.') '.' ->'.$tidy->errorBuffer);
						}
						else
						{
							$newBody = $cleaned;
						}
						if (!$preserveHTML)
						{
							// filter only the 'body', as we only want that part, if we throw away the html
							$matches = array();
							preg_match('`(<htm.+?<body[^>]*>)(.+?)(</body>.*?</html>)`ims', $newBody, $matches);
							if ($matches[2])
							{
								$hasOther = true;
								$newBody = $matches[2];
							}
						}
					}
					else
					{
						// htmLawed filter only the 'body'
						$matches = array();
						preg_match('`(<htm.+?<body[^>]*>)(.+?)(</body>.*?</html>)`ims', $newBody, $matches);
						if ($matches[2])
						{
							$hasOther = true;
							$newBody = $matches[2];
						}
						$htmLawed = new Html\HtmLawed();
						// the next line should not be needed, but produces better results on HTML 2 Text conversion,
						// as we switched off HTMLaweds tidy functionality
						$newBody = str_replace(array('&amp;amp;','<DIV><BR></DIV>',"<DIV>&nbsp;</DIV>",'<div>&nbsp;</div>'),array('&amp;','<BR>','<BR>','<BR>'),$newBody);
						$newBody = $htmLawed->run($newBody,self::$htmLawed_config);
						if ($hasOther && $preserveHTML) $newBody = $matches[1]. $newBody. $matches[3];
						$alreadyHtmlLawed=true;
					}
					//error_log(__METHOD__.' ('.__LINE__.') '.' after purify:'.$newBody);
					if ($preserveHTML==false) $newBody = Mail\Html::convertHTMLToText($newBody,self::$displayCharset,true,true);
					//error_log(__METHOD__.' ('.__LINE__.') '.' after convertHTMLToText:'.$newBody);
					if ($preserveHTML==false) $newBody = nl2br($newBody); // we need this, as htmLawed removes \r\n
					/*if (!$alreadyHtmlLawed) */ $mailClass->getCleanHTML($newBody); // remove stuff we regard as unwanted
					if ($preserveHTML==false) $newBody = str_replace("<br />","\r\n",$newBody);
					//error_log(__METHOD__.' ('.__LINE__.') '.' after getClean:'.$newBody);
				}
				$message .= $newBody;
				continue;
			}
			//error_log(__METHOD__.' ('.__LINE__.') '.' Body(after specialchars):'.$newBody);
			//use Mail\Html::convertHTMLToText instead of strip_tags, (even message is plain text) as strip_tags eats away too much
			//$newBody = strip_tags($newBody); //we need to fix broken tags (or just stuff like "<800 USD/p" )
			$newBody = Mail\Html::convertHTMLToText($newBody,self::$displayCharset,false,false);
			//error_log(__METHOD__.' ('.__LINE__.') '.' Body(after strip tags):'.$newBody);
			$newBody = htmlspecialchars_decode($newBody,ENT_QUOTES);
			//error_log(__METHOD__.' ('.__LINE__.') '.' Body (after hmlspc_decode):'.$newBody);
			$message .= $newBody;
			//continue;
		}
		return $message;
	}

	static function wordwrap($str, $cols, $cut, $dontbreaklinesstartingwith=false)
	{
		$lines = explode("\n", $str);
		$newStr = '';
		foreach($lines as $line)
		{
			// replace tabs by 8 space chars, or any tab only counts one char
			//$line = str_replace("\t","        ",$line);
			//$newStr .= wordwrap($line, $cols, $cut);
			$allowedLength = $cols-strlen($cut);
			//dont try to break lines with links, chance is we mess up the text is way too big
			if (strlen($line) > $allowedLength && stripos($line,'href=')===false &&
				($dontbreaklinesstartingwith==false ||
				 ($dontbreaklinesstartingwith &&
				  strlen($dontbreaklinesstartingwith)>=1 &&
				  substr($line,0,strlen($dontbreaklinesstartingwith)) != $dontbreaklinesstartingwith
				 )
				)
			   )
			{
				$s=explode(" ", $line);
				$line = "";
				$linecnt = 0;
				foreach ($s as &$v) {
					$cnt = strlen($v);
					// only break long words within the wordboundaries,
					// but it may destroy links, so we check for href and dont do it if we find one
					// we check for any html within the word, because we do not want to break html by accident
					if($cnt > $allowedLength && stripos($v,'href=')===false && stripos($v,'onclick=')===false && $cnt == strlen(html_entity_decode($v)))
					{
						$v=wordwrap($v, $allowedLength, $cut, true);
					}
					// the rest should be broken at the start of the new word that exceeds the limit
					if ($linecnt+$cnt > $allowedLength) {
						$v=$cut.$v;
						#$linecnt = 0;
						$linecnt =strlen($v)-strlen($cut);
					} else {
						$linecnt += $cnt;
					}
					if (strlen($v)) $line .= (strlen($line) ? " " : "").$v;
				}
			}
			$newStr .= $line . "\n";
		}
		return $newStr;
	}

	/**
	 * getMessageEnvelope
	 * get parsed headers from message
	 * @param string/int $_uid the messageuid,
	 * @param string/int $_partID = '' , the partID, may be omitted
	 * @param boolean $decode flag to do the decoding on the fly
	 * @param string $_folder folder to work on
	 * @param boolean $_useHeaderInsteadOfEnvelope - force getMessageHeader method to be used for fetching Envelope Information
	 * @return array the message header
	 */
	function getMessageEnvelope($_uid, $_partID = '',$decode=false, $_folder='', $_useHeaderInsteadOfEnvelope=false)
	{
		//error_log(__METHOD__.' ('.__LINE__.') '.":$_uid,$_partID,$decode,$_folder".function_backtrace());
		if (empty($_folder)) $_folder = $this->sessionData['mailbox'] ?? $this->icServer->getCurrentMailbox();
		//error_log(__METHOD__.' ('.__LINE__.') '.":$_uid,$_partID,$decode,$_folder");
		if((empty($_partID)||$_partID=='null')&&$_useHeaderInsteadOfEnvelope===false) {
			$uidsToFetch = new Horde_Imap_Client_Ids();
			if (!(is_object($_uid) || is_array($_uid))) $_uid = (array)$_uid;
			$uidsToFetch->add($_uid);

			$fquery = new Horde_Imap_Client_Fetch_Query();
			$envFields = new Horde_Mime_Headers();
			$fquery->envelope();
			$fquery->size();
			$headersNew = $this->icServer->fetch($_folder, $fquery, array(
				'ids' => $uidsToFetch,
			));
			if (is_object($headersNew)) {
				foreach($headersNew as &$_headerObject) {
					$env = $_headerObject->getEnvelope();
					//_debug_array($envFields->singleFields());
					$singleFields = $envFields->singleFields();
					foreach ($singleFields as &$v)
					{
						switch ($v)
						{
							case 'to':
							case 'reply-to':
							case 'from':
							case 'cc':
							case 'bcc':
							case 'sender':
								//error_log(__METHOD__.' ('.__LINE__.') '.$v.'->'.array2string($env->$v->addresses));
								$envelope[$v]=$env->$v->addresses;
								$address = array();
								if (!is_array($envelope[$v])) break;
								foreach ($envelope[$v] as $k => $ad)
								{
									if (stripos($ad,'@')===false)
									{
										$remember=$k;
									}
									else
									{
										$address[] = (isset($remember)?$envelope[$v][$remember].' ':'').$ad;
										$remember=null;
									}
								}
								$envelope[$v] = $address;
								break;
							case 'date':
								$envelope[$v]=DateTime::to($env->$v);
								break;
							default:
								$envelope[$v]=$env->$v;
						}
					}
					$envelope['size']=$_headerObject->getSize();
				}
			}
			$envelope = array_change_key_case($envelope,CASE_UPPER);
			//if ($decode) _debug_array($envelope);
			//error_log(__METHOD__.' ('.__LINE__.') '.array2string($envelope));
			if ($decode)
			{
				foreach ($envelope as $key => $rvV)
				{
					//try idn conversion only on 'FROM', 'TO', 'CC', 'BCC', 'SENDER', 'REPLY-TO'
					$envelope[$key]=self::decode_header($rvV,in_array($key,array('FROM', 'TO', 'CC', 'BCC', 'SENDER', 'REPLY-TO')));
				}
			}
			return $envelope;
		} else {

			$headers = $this->getMessageHeader($_uid, $_partID, true,true,$_folder);

			//error_log(__METHOD__.' ('.__LINE__.') '.':'.array2string($headers));
			//_debug_array($headers);
			$newData = array(
				'DATE'		=> $headers['DATE'],
				'SUBJECT'	=> ($decode ? self::decode_header($headers['SUBJECT']):$headers['SUBJECT']),
				'MESSAGE_ID'	=> $headers['MESSAGE-ID']
			);
			if (isset($headers['IN-REPLY-TO'])) $newData['IN-REPLY-TO'] = $headers['IN-REPLY-TO'];
			if (isset($headers['REFERENCES'])) $newData['REFERENCES'] = $headers['REFERENCES'];
			if (isset($headers['THREAD-TOPIC'])) $newData['THREAD-TOPIC'] = $headers['THREAD-TOPIC'];
			if (isset($headers['THREAD-INDEX'])) $newData['THREAD-INDEX'] = $headers['THREAD-INDEX'];
			if (isset($headers['LIST-ID'])) $newData['LIST-ID'] = $headers['LIST-ID'];
			if (isset($headers['SIZE'])) $newData['SIZE'] = $headers['SIZE'];
			//_debug_array($newData);
			$recepientList = array('FROM', 'TO', 'CC', 'BCC', 'SENDER', 'REPLY-TO');
			foreach($recepientList as $recepientType) {
				if(isset($headers[$recepientType])) {
					if ($decode) $headers[$recepientType] =  self::decode_header($headers[$recepientType],true);
					//error_log(__METHOD__.__LINE__." ".$recepientType."->".array2string($headers[$recepientType]));
					foreach(self::parseAddressList($headers[$recepientType]) as $singleAddress) {
						$addressData = array(
							'PERSONAL_NAME'		=> $singleAddress->personal ? $singleAddress->personal : 'NIL',
							'AT_DOMAIN_LIST'	=> $singleAddress->adl ? $singleAddress->adl : 'NIL',
							'MAILBOX_NAME'		=> $singleAddress->mailbox ? $singleAddress->mailbox : 'NIL',
							'HOST_NAME'		=> $singleAddress->host ? $singleAddress->host : 'NIL',
							'EMAIL'			=> $singleAddress->host ? $singleAddress->mailbox.'@'.$singleAddress->host : $singleAddress->mailbox,
						);
						if($addressData['PERSONAL_NAME'] != 'NIL') {
							$addressData['RFC822_EMAIL'] = imap_rfc822_write_address($singleAddress->mailbox, $singleAddress->host, $singleAddress->personal);
						} else {
							$addressData['RFC822_EMAIL'] = 'NIL';
						}
						$newData[$recepientType][] = ($addressData['RFC822_EMAIL']!='NIL'?$addressData['RFC822_EMAIL']:$addressData['EMAIL']);//$addressData;
					}
				} else {
					if($recepientType == 'SENDER' || $recepientType == 'REPLY-TO') {
						$newData[$recepientType] = $newData['FROM'];
					} else {
						$newData[$recepientType] = array();
					}
				}
			}
			//if ($decode) _debug_array($newData);
			return $newData;
		}
	}

	/**
	 * Get parsed headers from message
	 *
	 * @param string/int $_uid the messageuid,
	 * @param string/int $_partID ='' , the partID, may be omitted
	 * @param boolean|string $decode flag to do the decoding on the fly or "object"
	 * @param boolean $preserveUnSeen flag to preserve the seen flag where applicable
	 * @param string $_folder folder to work on
	 * @return array|Horde_Mime_Headers message header as array or object
	 */
	function getMessageHeader($_uid, $_partID = '',$decode=false, $preserveUnSeen=false, $_folder='')
	{
		//error_log(__METHOD__.' ('.__LINE__.') '.':'.$_uid.', '.$_partID.', '.$decode.', '.$preserveUnSeen.', '.$_folder);
		if (empty($_folder)) $_folder = $this->sessionData['mailbox'] ?? $this->icServer->getCurrentMailbox();
		$uidsToFetch = new Horde_Imap_Client_Ids();
		if (!(is_object($_uid) || is_array($_uid))) $_uid = (array)$_uid;
		$uidsToFetch->add($_uid);

		$fquery = new Horde_Imap_Client_Fetch_Query();
		if ($_partID != '')
		{
			$fquery->headerText(array('id'=>$_partID,'peek'=>$preserveUnSeen));
			$fquery->structure();
		}
		else
		{
			$fquery->headerText(array('peek'=>$preserveUnSeen));
		}
		$fquery->size();

		$headersNew = $this->icServer->fetch($_folder, $fquery, array(
			'ids' => $uidsToFetch,
		));
		if (is_object($headersNew)) {
			foreach($headersNew as $_fetchObject)
			{
				$headers = $_fetchObject->getHeaderText(0,Horde_Imap_Client_Data_Fetch::HEADER_PARSE);
				if ($_partID != '')
				{
					$mailStructureObject = $_fetchObject->getStructure();
					foreach ($mailStructureObject->contentTypeMap() as $mime_id => $mime_type)
					{
						if ($mime_id==$_partID)
						{
							//error_log(__METHOD__.' ('.__LINE__.') '."$mime_id == $_partID".array2string($_headerObject->getHeaderText($mime_id,Horde_Imap_Client_Data_Fetch::HEADER_PARSE)->toArray()));
							$headers = $_fetchObject->getHeaderText($mime_id,Horde_Imap_Client_Data_Fetch::HEADER_PARSE);
							break;
						}
					}
				}
				$size = $_fetchObject->getSize();
				//error_log(__METHOD__.__LINE__.'#'.$size);
			}
			if ($decode === 'object')
			{
				if (is_object($headers)) $headers->setUserAgent('EGroupware API '.$GLOBALS['egw_info']['server']['versions']['phpgwapi']);
				return $headers;
			}
			$retValue = is_object($headers) ? $headers->toArray():array();
			if ($size) $retValue['size'] = $size;
		}
		$retValue = array_change_key_case($retValue,CASE_UPPER);
		//error_log(__METHOD__.' ('.__LINE__.') '.array2string($retValue));
		// if SUBJECT is an array, use thelast one, as we assume something with the unfolding for the subject did not work
		if (is_array($retValue['SUBJECT']))
		{
			$retValue['SUBJECT'] = $retValue['SUBJECT'][count($retValue['SUBJECT'])-1];
		}
		//error_log(__METHOD__.' ('.__LINE__.') '.':'.array2string($decode ? self::decode_header($retValue,true):$retValue));
		if ($decode)
		{
			foreach ($retValue as $key => $rvV)
			{
				//try idn conversion only on 'FROM', 'TO', 'CC', 'BCC', 'SENDER', 'REPLY-TO'
				$retValue[$key]=self::decode_header($rvV,in_array($key,array('FROM', 'TO', 'CC', 'BCC', 'SENDER', 'REPLY-TO')));
			}
		}
		return $retValue;
	}

	/**
	 * getMessageRawHeader
	 * get messages raw header data
	 * @param string/int $_uid the messageuid,
	 * @param string/int $_partID = '' , the partID, may be omitted
	 * @param string $_folder folder to work on
	 * @return string the message header
	 */
	function getMessageRawHeader($_uid, $_partID = '', $_folder = '')
	{
		static $rawHeaders;
		if (empty($_folder)) $_folder = $this->sessionData['mailbox'] ?? $this->icServer->getCurrentMailbox();
		//error_log(__METHOD__.' ('.__LINE__.') '." Try Using Cache for raw Header $_uid, $_partID in Folder $_folder");

		if (!isset($rawHeaders)||!is_array($rawHeaders)) $rawHeaders = Cache::getCache(Cache::INSTANCE,'email','rawHeadersCache'.trim($GLOBALS['egw_info']['user']['account_id']),null,array(),60*60*1);
		if (isset($rawHeaders[$this->icServer->ImapServerId][(string)$_folder][$_uid][(empty($_partID)?'NIL':$_partID)]))
		{
			//error_log(__METHOD__.' ('.__LINE__.') '." Using Cache for raw Header $_uid, $_partID in Folder $_folder");
			return $rawHeaders[$this->icServer->ImapServerId][(string)$_folder][$_uid][(empty($_partID)?'NIL':$_partID)];
		}
		$uidsToFetch = new Horde_Imap_Client_Ids();
		$uid = $_uid;
		if (!(is_object($_uid) || is_array($_uid))) $uid = (array)$_uid;
		$uidsToFetch->add($uid);

		$fquery = new Horde_Imap_Client_Fetch_Query();
		if ($_partID != '')
		{
			$fquery->headerText(array('id'=>$_partID,'peek'=>true));
			$fquery->structure();
		}
		else
		{
			$fquery->headerText(array('peek'=>true));
		}
		$headersNew = $this->icServer->fetch($_folder, $fquery, array(
			'ids' => $uidsToFetch,
		));
		if (is_object($headersNew)) {
			foreach($headersNew as &$_headerObject) {
				$retValue = $_headerObject->getHeaderText();
				if ($_partID != '')
				{
					$mailStructureObject = $_headerObject->getStructure();
					foreach ($mailStructureObject->contentTypeMap() as $mime_id => $mime_type)
					{
						if ($mime_id==$_partID)
						{
							$retValue = $_headerObject->getHeaderText($mime_id);
						}
					}
				}
			}
		}
		$rawHeaders[$this->icServer->ImapServerId][(string)$_folder][$_uid][(empty($_partID)?'NIL':$_partID)]=$retValue;
		Cache::setCache(Cache::INSTANCE,'email','rawHeadersCache'.trim($GLOBALS['egw_info']['user']['account_id']),$rawHeaders,60*60*1);
		return $retValue;
	}

	/**
	 * getStyles - extracts the styles from the given bodyparts
	 * @param array $_bodyParts  with the bodyparts
	 * @return string a preformatted string with the mails converted to text
	 */
	static function &getStyles($_bodyParts)
	{
		$style = $ret = '';
		if (empty($_bodyParts)) return $ret;
		foreach((array)$_bodyParts as $singleBodyPart) {
			if (!isset($singleBodyPart['body'])) {
				$singleBodyPart['body'] = self::getStyles($singleBodyPart);
				$style .= $singleBodyPart['body'];
				continue;
			}

			if (empty($singleBodyPart['charSet'])) $singleBodyPart['charSet'] = Translation::detect_encoding($singleBodyPart['body']);
			$singleBodyPart['body'] = Translation::convert(
				$singleBodyPart['body'],
				strtolower($singleBodyPart['charSet'])
			);
			$ct = 0;
			$newStyle=array();
			if (stripos($singleBodyPart['body'],'<style')!==false)  $ct = preg_match_all('#<style(?:\s.*)?>(.+)</style>#isU', $singleBodyPart['body'], $newStyle);
			if ($ct>0)
			{
				//error_log(__METHOD__.' ('.__LINE__.') '.'#'.$ct.'#'.array2string($newStyle));
				$style2buffer = implode('',$newStyle[0]);
			}
			if (!empty($style2buffer) && strtoupper(self::$displayCharset) == 'UTF-8')
			{
				//error_log(__METHOD__.' ('.__LINE__.') '.array2string($style2buffer));
				$test = json_encode($style2buffer);
				//error_log(__METHOD__.' ('.__LINE__.') '.'#'.$test.'# ->'.strlen($style2buffer).' Error:'.json_last_error());
				//if (json_last_error() != JSON_ERROR_NONE && strlen($style2buffer)>0)
				if ($test=="null" && strlen($style2buffer)>0)
				{
					// this should not be needed, unless something fails with charset detection/ wrong charset passed
					error_log(__METHOD__.' ('.__LINE__.') '.' Found Invalid sequence for utf-8 in CSS:'.$style2buffer.' Charset Reported:'.$singleBodyPart['charSet'].' Carset Detected:'.Translation::detect_encoding($style2buffer));
					$style2buffer = utf8_encode($style2buffer);
				}
			}
			$style .= $style2buffer ?? '';
		}
		// clean out comments and stuff
		$search = array(
			'@url\(http:\/\/[^\)].*?\)@si',  // url calls e.g. in style definitions
//			'@<!--[\s\S]*?[ \t\n\r]*-->@',   // Strip multi-line comments including CDATA
//			'@<!--[\s\S]*?[ \t\n\r]*--@',    // Strip broken multi-line comments including CDATA
		);
		$style = preg_replace($search,"",$style);

		// CSS Security
		// http://code.google.com/p/browsersec/wiki/Part1#Cascading_stylesheets
		$css = preg_replace('/(javascript|expression|-moz-binding)/i','',$style);
		if (stripos($css,'script')!==false) Mail\Html::replaceTagsCompletley($css,'script'); // Strip out script that may be included
		// we need this, as styledefinitions are enclosed with curly brackets; and template stuff tries to replace everything between curly brackets that is having no horizontal whitespace
		// as the comments as <!-- styledefinition --> in stylesheet are outdated, and ck-editor does not understand it, we remove it
		$css = str_replace(array(':','<!--','-->'),array(': ','',''),$css);
		//error_log(__METHOD__.' ('.__LINE__.') '.$css);

		// check if the outlook style fix is there then set the initial line-height, since the fix is setting it to line-height:0
		// which breaks all tr lines in the content.
		if (preg_match('/Outlook 2016 Height Fix/i', $css)) $css .='<style>tr {line-height: initial} </style>';

		// TODO: we may have to strip urls and maybe comments and ifs
		return $css;
	}

	/**
	 * getMessageRawBody
	 * get the message raw body
	 * @param string/int $_uid the messageuid,
	 * @param string/int $_partID = '' , the partID, may be omitted
	 * @param string $_folder folder to work on
	 * @param boolean $_stream =false true: return a stream, false: return string, stream suppresses any caching
	 * @return ?string the message body or null if $_uid or $_partID not found
	 */
	function getMessageRawBody($_uid, $_partID = '', $_folder='', $_stream=false)
	{
		static $rawBody;
		$body = null;
		if (empty($_folder)) $_folder = $this->sessionData['mailbox']?? $this->icServer->getCurrentMailbox();
		$_uid = !(is_object($_uid) || is_array($_uid)) ? (array)$_uid : $_uid;

		if (!$_stream && isset($rawBody[$this->icServer->ImapServerId][(string)$_folder][$_uid[0]][(empty($_partID)?'NIL':$_partID)]))
		{
			//error_log(__METHOD__.' ('.__LINE__.') '." Using Cache for raw Body $_uid, $_partID in Folder $_folder");
			return $rawBody[$this->icServer->ImapServerId][(string)$_folder][$_uid[0]][(empty($_partID)?'NIL':$_partID)];
		}

		$uidsToFetch = new Horde_Imap_Client_Ids();

		$uidsToFetch->add($_uid);

		$fquery = new Horde_Imap_Client_Fetch_Query();
		$fquery->fullText(array('peek'=>true));
		if ($_partID != '')
		{
			$fquery->structure();
			$fquery->bodyPart($_partID,array('peek'=>true));
		}
		$headersNew = $this->icServer->fetch($_folder, $fquery, array(
			'ids' => $uidsToFetch,
		));
		if (is_object($headersNew)) {
			foreach($headersNew as &$_headerObject) {
				$body = $_headerObject->getFullMsg($_stream);
				if ($_partID != '')
				{
					$mailStructureObject = $_headerObject->getStructure();
					foreach ($mailStructureObject->contentTypeMap() as $mime_id => $mime_type)
					{
						if ($mime_id==$_partID)
						{
							$body = $_headerObject->getBodyPart($mime_id, $_stream);
						}
					}
				}
			}
		}

		if (!$_stream)
		{
			//error_log(__METHOD__.' ('.__LINE__.') '."[{$this->icServer->ImapServerId}][$_folder][$_uid][".(empty($_partID)?'NIL':$_partID)."]");
			$rawBody[$this->icServer->ImapServerId][(string)$_folder][$_uid[0]][(empty($_partID)?'NIL':$_partID)] = $body;
		}
		return $body;
	}

	/**
	 * Get structure of a mail or part of a mail
	 *
	 * @param int $_uid
	 * @param string $_partID = null
	 * @param string $_folder = null
	 * @param boolean $_preserveSeen = false flag to preserve the seenflag by using body.peek
	 * @param Horde_Imap_Client_Fetch_Query $fquery=null default query just structure
	 * @return Horde_Mime_Part
	 */
	function getStructure($_uid, $_partID=null, $_folder=null, $_preserveSeen=false)
	{
		if (self::$debug) error_log( __METHOD__.' ('.__LINE__.') '.":$_uid, $_partID");

		if (empty($_folder))
		{
			$_folder = $this->sessionData['mailbox'] ?? $this->icServer->getCurrentMailbox();
		}
		$uidsToFetch = new Horde_Imap_Client_Ids();

		$uidsToFetch->add($_uid);

		try
		{
			$_fquery = new Horde_Imap_Client_Fetch_Query();
	// not sure why Klaus add these, seem not necessary
	//		$fquery->envelope();
	//		$fquery->size();
			$_fquery->structure();
			if ($_partID) $_fquery->bodyPart($_partID, array('peek' => $_preserveSeen));

			$mail = $this->icServer->fetch($_folder, $_fquery, array(
				'ids' => $uidsToFetch,
			))->first();
			if (is_object($mail))
			{
				$structure = $mail->getStructure();
				$isSmime = Mail\Smime::isSmime(($mimeType = $structure->getType())) || Mail\Smime::isSmime(($protocol=$structure->getContentTypeParameter('protocol')));
				if ($isSmime && !class_exists('mail_zpush', false))
				{
					return $this->resolveSmimeMessage($structure, array(
						'uid' => $_uid,
						'mailbox' => $_folder,
						'mimeType' => Mail\Smime::isSmime($protocol) ? $protocol: $mimeType
					));
				}
				return $mail->getStructure();
			}
			else
			{
				return null;
			}
		}
		catch (Mail\Smime\PassphraseMissing $e)
		{
			// re-throw the exception to be caught on UI
			throw $e;
		}
		catch (Exception $e)
		{
			error_log(__METHOD__.' ('.__LINE__.') '.' Could not fetch structure on mail:'.$_uid.' Serverprofile->'.$this->icServer->ImapServerId.' Message:'.$e->getMessage().' Stack:'.function_backtrace());
			return null;
		}
	}

	/**
	 * Parse the structure for attachments
	 *
	 * Returns not the attachments itself, but an array of information about the attachment
	 *
	 * @param int $_uid the messageuid,
	 * @param string $_partID = null , the partID, may be omitted
	 * @param Horde_Mime_Part $_structure = null if given use structure for parsing
	 * @param boolean $fetchEmbeddedImages = true,
	 * @param boolean $fetchTextCalendar = false,
	 * @param boolean $resolveTNEF = true
	 * @param string $_folder folder to work on
	 * @return array  an array of information about the attachment: array of array(name, size, mimeType, partID, encoding)
	 */
	function getMessageAttachments($_uid, $_partID=null, Horde_Mime_Part $_structure=null, $fetchEmbeddedImages=true, $fetchTextCalendar=false, $resolveTNEF=true, $_folder='')
	{
		if (self::$debug) error_log( __METHOD__.":$_uid, $_partID");
		if (empty($_folder)) $_folder = $this->sessionData['mailbox'] ?? $this->icServer->getCurrentMailbox();
		$attachments = array();
		if (!isset($_structure))
		{
			$_structure = $this->getStructure($_uid, $_partID,$_folder,true);
			//error_log(__METHOD__.' ('.__LINE__.') '.':'.print_r($_structure->contentTypeMap(),true));
		}
		if (!$_structure || !$_structure->contentTypeMap()) return array();
		if (!empty($_partID)) $_structure = $_structure->getPart($_partID);
		$skipParts = array();
		$tnefParts = array();
		$skip = 0;
		foreach($_structure->contentTypeMap() as $mime_id => $mime_type)
		{
			// skip multipart/encrypted incl. its two sub-parts, as we show 2. sub-part as body to be decrypted client-side
			if ($mime_type == 'multipart/encrypted')
			{
				$skip = 2;
				continue;
			}
			elseif($skip)
			{
				$skip--;
				continue;
			}
			$part = $_structure->getPart($mime_id);
			//error_log(__METHOD__.' ('.__LINE__.') '.':'.' Uid:'.$uid.' Part:'.$_partID.'->'.array2string($part->getMimeId()));
			//error_log(__METHOD__.' ('.__LINE__.') '.':'.' Uid:'.$uid.' Part:'.$_partID.'->'.$part->getPrimaryType().'/'.$part->getSubType().'->'.$part->getDisposition());
			//error_log(__METHOD__.' ('.__LINE__.') '.':'.' Uid:'.$uid.' Part:'.$_partID.'->'.array2string($part->getAllDispositionParameters()));
			//error_log(__METHOD__.' ('.__LINE__.') '.':'.' Uid:'.$uid.' Part:'.$_partID.'->'.array2string($part->getAllContentTypeParameters()));
			$partDisposition = $part->getDisposition();
			$partPrimaryType = $part->getPrimaryType();
			// we only want to retrieve the attachments of the current mail, not those of possible
			// attached mails
			if ($mime_type=='message/rfc822' && $_partID!=$mime_id)
			{
				//error_log(__METHOD__.' ('.__LINE__.') '.' Uid:'.$uid.'->'.$mime_id.':'.array2string($part->contentTypeMap()));
				foreach($part->contentTypeMap() as $sub_id => $sub_type) {if ($sub_id != $mime_id) $skipParts[$sub_id] = $sub_type;}
			}
			if (empty($partDisposition) && $partPrimaryType != 'multipart' && $partPrimaryType != 'text')
			{
				// the absence of an partDisposition does not necessarily indicate there is no attachment. it may be an
				// attachment with no link to show the attachment inline.
				// Considering this: we "list" everything that matches the above criteria
				// as attachment in order to not loose/miss information on our data
				$partDisposition='attachment';
			}
			//error_log(__METHOD__.' ('.__LINE__.') '.' Uid:'.$uid.' Part:'.$_partID.'->'.$mime_id.':'.array2string($skipParts));
			if (array_key_exists($mime_id,$skipParts)) continue;

			if ($partDisposition == 'attachment' ||
				(($partDisposition == 'inline' || empty($partDisposition)) && $partPrimaryType == 'image' && $part->getContentId()=='') ||
				(($partDisposition == 'inline' || empty($partDisposition)) && $partPrimaryType != 'image' && $partPrimaryType != 'text' && $partPrimaryType != 'multipart') ||
				($mime_type=='image/tiff') || //always fetch. even if $fetchEmbeddedImages is false. as we cannot display tiffs
				($fetchEmbeddedImages && ($partDisposition == 'inline' || empty($partDisposition)) && $partPrimaryType == 'image') ||
				($fetchTextCalendar && $partPrimaryType == 'text' && $part->getSubType() == 'calendar'))
			{
				// if type is message/rfc822 and _partID is given, and MimeID equals partID
				// we attempt to fetch "ourselves"
				if ($_partID==$part->getMimeId() && $part->getPrimaryType()=='message') continue;
				$attachment = $part->getAllDispositionParameters();
				$attachment['disposition'] = $part->getDisposition();
				$attachment['mimeType'] = $mime_type;
				$attachment['uid'] = $_uid;
				$attachment['partID'] = $mime_id;
				if (!isset($attachment['name'])||empty($attachment['name'])) $attachment['name'] = $part->getName() ? $part->getName() : ($mime_type == "message/rfc822" ? lang('forwarded message') : lang('attachment'));;
				if ($fetchTextCalendar)
				{
					//error_log(__METHOD__.' ('.__LINE__.') '.array2string($part->getAllContentTypeParameters()));
					$method = $part->getContentTypeParameter('method');
					if ($method) $attachment['method'] = $method;
					if (!isset($attachment['name'])) $attachment['name'] = 'event.ics';
				}
				$attachment['size'] = $part->getBytes();
				if (($cid = $part->getContentId())) $attachment['cid'] = $cid;
				if (empty($attachment['name'])) $attachment['name'] = (isset($attachment['cid'])&&!empty($attachment['cid'])?$attachment['cid']:lang("unknown").'_Uid'.$_uid.'_Part'.$mime_id).'.'.MimeMagic::mime2ext($mime_type);
				//error_log(__METHOD__.' ('.__LINE__.') '.' Uid:'.$uid.' Part:'.$_partID.'->'.$mime_id.':'.array2string($attachment));
				//typical winmail.dat attachment is
				//Array([size] => 1462762[filename] => winmail.dat[mimeType] => application/ms-tnef[uid] => 100[partID] => 2[name] => winmail.dat)
				if ($resolveTNEF && ($attachment['mimeType']=='application/ms-tnef' || !strcasecmp($attachment['name'],'winmail.dat')))
				{
					$tnefParts[] = $attachment;
				}
				else
				{
					$attachments[] = $attachment;
				}
			}
		}
		if ($resolveTNEF && !empty($tnefParts))
		{
			//error_log(__METHOD__.__LINE__.array2string($tnefParts));
			foreach ($tnefParts as $k => $tnp)
			{
				$tnefResolved=false;
				$tnef_data = $this->getAttachment($tnp['uid'],$tnp['partID'],$k,false);
				$myTnef = $this->tnef_decoder($tnef_data['attachment']);
				//error_log(__METHOD__.__LINE__.array2string($myTnef->getParts()));
				// Note: MimeId starts with 0, almost always, we cannot use that as winmail_id
				// we need to build Something that meets the needs
				if ($myTnef)
				{
					foreach($myTnef->getParts() as $mime_id => $part)
					{
						$tnefResolved=true;
						$attachment = $part->getAllDispositionParameters();
						$attachment['disposition'] = $part->getDisposition();
						$attachment['mimeType'] = $part->getType();
						$attachment['uid'] = $tnp['uid'];
						$attachment['partID'] = $tnp['partID'];
						$attachment['is_winmail'] = $tnp['uid'].'@'.$tnp['partID'].'@'.$mime_id;
						if (!isset($attachment['name'])||empty($attachment['name'])) $attachment['name'] = $part->getName();
						$attachment['size'] = $part->getBytes();
						if (($cid = $part->getContentId())) $attachment['cid'] = $cid;
						if (empty($attachment['name'])) $attachment['name'] = (isset($attachment['cid'])&&!empty($attachment['cid'])?$attachment['cid']:lang("unknown").'_Uid'.$_uid.'_Part'.$mime_id).'.'.MimeMagic::mime2ext($attachment['mimeType']);
						$attachments[] = $attachment;
					}
				}
				if ($tnefResolved===false) $attachments[]=$tnp;
			}
		}
		//error_log(__METHOD__.__LINE__.array2string($attachments));
		return $attachments;
	}

	/**
	 * Decode TNEF type attachment into Multipart/mixed attachment
	 *
	 * @param MIME object $data Mime part object
	 *
	 * @return boolean|Horde_Mime_part Multipart/Mixed part decoded attachments |
	 *	return false if there's no attachments or failure
	 */
	public function tnef_decoder( $data )
	{
		foreach(array('Horde_Compress', 'Horde_Icalendar', 'Horde_Mapi') as $class)
		{
			if (!class_exists($class))
			{
				error_log(__METHOD__."() missing required PEAR package $class --> aborting");
				return false;
			}
		}
		$parts_obj = new Horde_Mime_part;
		$parts_obj->setType('multipart/mixed');

		$tnef_object = Horde_Compress::factory('tnef');
		try
		{
			$tnef_data = $tnef_object->decompress($data);
		}
		catch (Horde_Exception $ex)
		{
			error_log(__METHOD__."() ".$ex->getMessage().' --> aborting');
			_egw_log_exception($ex);
			return false;
		}
		if (is_array($tnef_data))
		{
			foreach ($tnef_data as &$data)
			{
				$tmp_part = new Horde_Mime_part;

				$tmp_part->setName($data['name']);
				$tmp_part->setContents($data['stream']);
				$tmp_part->setDescription($data['name']);

				$type = $data['type'] . '/' . $data['subtype'];
				if (in_array($type, array('application/octet-stream', 'application/base64')))
				{
					$type = Horde_Mime_Magic::filenameToMIME($data['name']);
				}
				$tmp_part->setType($type);
				//error_log(__METHOD__.__LINE__.array2string($tmp_part));
				$parts_obj->addPart($tmp_part);
			}
			$parts_obj->buildMimeIds();
			return $parts_obj;
		}
		return false;
	}

	/**
	 * Get attachment data as string, to be used with Link::(get|set)_data()
	 *
	 * @param int $acc_id
	 * @param string $_mailbox
	 * @param int $_uid
	 * @param string $_partID
	 * @param int $_winmail_nr
	 * @return resource stream with attachment content
	 */
	public static function getAttachmentAccount($acc_id, $_mailbox, $_uid, $_partID, $_winmail_nr)
	{
		$bo = self::getInstance(false, $acc_id);

		$attachment = $bo->getAttachment($_uid, $_partID, $_winmail_nr, false, true, $_mailbox);

		return $attachment['attachment'];
	}

	/**
	 * Retrieve tnef attachments
	 *
	 * @param int $_uid the uid of the message
	 * @param string $_partID the id of the part, which holds the attachment
	 * @param boolean $_stream =false flag to indicate if the attachment is to be fetched or returned as filepointer
	 * @param string $_folder =null folder to use if not current folder
	 *
	 * @return array returns an array of all resolved embeded attachments from winmail.dat
	 */
	function getTnefAttachments ($_uid, $_partID, $_stream=false, $_folder=null)
	{
		$tnef_data = $this->getAttachment($_uid, $_partID,0,false, false , $_folder);
		$tnef_parts = $this->tnef_decoder($tnef_data['attachment']);
		$attachments = array();
		if ($tnef_parts)
		{
			foreach($tnef_parts->getParts() as $mime_id => $part)
			{

				$attachment = $part->getAllDispositionParameters();
				$attachment['mimeType'] = $part->getType();
				if (!isset($attachment['filename'])||empty($attachment['filename'])) $attachment['filename'] = $part->getName();
				if (($cid = $part->getContentId())) $attachment['cid'] = $cid;
				if (empty($attachment['filename']))
				{
					$attachment['filename'] = (isset($attachment['cid'])&&!empty($attachment['cid'])?
						$attachment['cid']:lang("unknown").'_Uid'.$_uid.'_Part'.$mime_id).'.'.MimeMagic::mime2ext($attachment['mimeType']);
				}

				$attachment['attachment'] = $part->getContents(array('stream'=>$_stream));

				$attachments[$_uid.'@'.$_partID.'@'.$mime_id] = $attachment;
			}
		}
		if (!is_array($attachments)) return false;
		return $attachments;
	}

	/**
	 * Retrieve a attachment
	 *
	 * @param int $_uid the uid of the message
	 * @param string $_partID the id of the part, which holds the attachment
	 * @param int $_winmail_nr = 0 winmail.dat attachment nr.
	 * @param boolean $_returnPart =true flag to indicate if the attachment is to be returned as horde mime part object
	 * @param boolean $_stream =false flag to indicate if the attachment is to be fetched or returned as filepointer
	 * @param string $_folder =null folder to use if not current folder
	 *
	 * @return array
	 */
	function getAttachment($_uid, $_partID, $_winmail_nr=0, $_returnPart=true, $_stream=false, $_folder=null)
	{
		//error_log(__METHOD__.__LINE__."Uid:$_uid, PartId:$_partID, WinMailNr:$_winmail_nr, ReturnPart:$_returnPart, Stream:$_stream, Folder:$_folder".function_backtrace());
		if (!isset($_folder)) $_folder = $this->sessionData['mailbox'] ?? $this->icServer->getCurrentMailbox();

		$uidsToFetch = new Horde_Imap_Client_Ids();
		if (!(is_object($_uid) || is_array($_uid))) $_uid = (array)$_uid;
		$uidsToFetch->add($_uid);

		$fquery = new Horde_Imap_Client_Fetch_Query();
		$fquery->structure();
		$fquery->bodyPart($_partID, array('peek'=>true));
		$headersNew = $this->icServer->fetch($_folder, $fquery, array(
			'ids' => $uidsToFetch,
		));
		if (is_object($headersNew)) {
			foreach($headersNew as $id=>$_headerObject) {
				$body = $_headerObject->getFullMsg();
				if ($_partID != '')
				{
					$mailStructureObject = $_headerObject->getStructure();
					if (!class_exists('mail_zpush', false) && (Mail\Smime::isSmime(($mimeType = $mailStructureObject->getType())) ||
							Mail\Smime::isSmime(($protocol=$mailStructureObject->getContentTypeParameter('protocol')))))
					{
						$mailStructureObject = $this->resolveSmimeMessage($mailStructureObject, array(
							'uid' => $_uid,
							'mailbox' => $_folder,
							'mimeType' => Mail\Smime::isSmime($protocol) ? $protocol : $mimeType

						));
					}
					$mailStructureObject->contentTypeMap();
					$part = $mailStructureObject->getPart($_partID);
					$partDisposition = ($part?$part->getDisposition():'failed');
					if ($partDisposition=='failed')
					{
						error_log(__METHOD__.'('.__LINE__.'):'.array2string($_uid).','.$_partID.' ID:'.$id.' HObject:'.array2string($_headerObject).' StructureObject:'.array2string($mailStructureObject->contentTypeMap()).'->'.function_backtrace());
					}
					// if $partDisposition is empty, we assume attachment, and hope that the function
					// itself is only triggered to fetch attachments
					if (empty($partDisposition)) $partDisposition='attachment';
					if ($part && ($partDisposition=='attachment' || $partDisposition=='inline' || ($part->getPrimaryType() == 'text' && $part->getSubType() == 'calendar')))
					{
						//$headerObject=$part->getAllDispositionParameters();//not used anywhere around here
						$structure_mime = $part->getType();
						$filename = $part->getName();
						$charset = $part->getContentTypeParameter('charset');
						//$structure_bytes = $part->getBytes(); $structure_partID=$part->getMimeId(); error_log(__METHOD__.__LINE__." fetchPartContents(".array2string($_uid).", $structure_partID, $_stream, $_preserveSeen,$structure_mime)" );
						if (empty($part->getContents())) $this->fetchPartContents($_uid, $part, $_stream, $_preserveSeen=true,$structure_mime);
						if ($_returnPart) return $part;
					}
				}
			}
		}
		$ext = MimeMagic::mime2ext($structure_mime);
		if ($ext && stripos($filename,'.')===false && stripos($filename,$ext)===false) $filename = trim($filename).'.'.$ext;
		if (!$part)
		{
			throw new Exception\WrongParameter("Error: Could not fetch attachment for Uid=".array2string($_uid).", PartId=$_partID, WinMailNr=$_winmail_nr, folder=$_folder");
		}
		$attachmentData = array(
			'type'		=> $structure_mime,
			'charset' => $charset,
			'filename'	=> $filename,
			'attachment'	=> $part->getContents(array(
				// tnef_decode needs strings not a stream
				'stream' => $_stream && !($filename == 'winmail.dat' && $_winmail_nr)
			)),
		);

		// try guessing the mimetype, if we get the application/octet-stream
		if (strtolower($attachmentData['type']) == 'application/octet-stream') $attachmentData['type'] = MimeMagic::filename2mime($attachmentData['filename']);
		# if the attachment holds a winmail number and is a winmail.dat then we have to handle that.
		if ( $filename == 'winmail.dat' && $_winmail_nr)
		{
			//by now _uid is of type array
			$tnefResolved=false;
			$wantedPart=$_uid[0].'@'.$_partID;
			$myTnef = $this->tnef_decoder($attachmentData['attachment']);
			//error_log(__METHOD__.__LINE__.array2string($myTnef->getParts()));
			// Note: MimeId starts with 0, almost always, we cannot use that as winmail_id
			// we need to build Something that meets the needs
			if ($myTnef)
			{
				foreach($myTnef->getParts() as $mime_id => $part)
				{
					$tnefResolved=true;
					$attachment = $part->getAllDispositionParameters();
					$attachment['mimeType'] = $part->getType();
					//error_log(__METHOD__.__LINE__.'#'.$mime_id.'#'.$filename.'#'.array2string($attachment));
					//error_log(__METHOD__.__LINE__." $_winmail_nr == $wantedPart@$mime_id");
					if ($_winmail_nr == $wantedPart.'@'.$mime_id)
					{
						//error_log(__METHOD__.__LINE__.'#'.$structure_mime.'#'.$filename.'#'.array2string($attachment));
						if (!isset($attachment['filename'])||empty($attachment['filename'])) $attachment['filename'] = $part->getName();
						if (($cid = $part->getContentId())) $attachment['cid'] = $cid;
						if (empty($attachment['filename'])) $attachment['filename'] = (isset($attachment['cid'])&&!empty($attachment['cid'])?$attachment['cid']:lang("unknown").'_Uid'.$_uid.'_Part'.$mime_id).'.'.MimeMagic::mime2ext($attachment['mimeType']);
						$wmattach = $attachment;
						$wmattach['attachment'] = $part->getContents(array('stream'=>$_stream));

					}
				}
			}
			if ($tnefResolved)
			{
				$ext = MimeMagic::mime2ext($wmattach['mimeType']);
				if ($ext && stripos($wmattach['filename'],'.')===false && stripos($wmattach['filename'],$ext)===false) $wmattach['filename'] = trim($wmattach['filename']).'.'.$ext;
				$attachmentData = array(
					'type'       => $wmattach['mimeType'],
					'filename'   => $wmattach['filename'],
					'attachment' => $wmattach['attachment'],
				);
			}
		}
		return $attachmentData;
	}

	/**
	 * Fetch a specific attachment from a message by it's cid
	 *
	 * this function is based on a on "Building A PHP-Based Mail Client"
	 * http://www.devshed.com
	 *
	 * @param string|int $_uid
	 * @param string $_cid
	 * @param string $_part
	 * @param boolean $_stream = null null do NOT fetch content, use fetchPartContents later
	 *	true:
	 * @return Horde_Mime_Part|false false on error / not found
	 */
	function getAttachmentByCID($_uid, $_cid, $_part, $_stream=null)
	{
		// some static variables to avoid fetching the same mail multiple times
		static $uid=null, $part=null, $structure=null;
		//error_log(__METHOD__.' ('.__LINE__.') '.":$_uid, $_cid, $_part");

		if(empty($_cid)) return false;

		if ($_uid != $uid || $_part != $part)
		{
			$structure = $this->getStructure($uid=$_uid, $part=$_part);
		}
		if (!$structure) return false;

		/** @var Horde_Mime_Part */
		$attachment = null;
		foreach($structure->contentTypeMap() as $mime_id => $mime_type)
		{
			$part = $structure->getPart($mime_id);

			if ($part->getPrimaryType() == 'image' &&
				(($cid = $part->getContentId()) &&
				// RB: seem a bit fague to search for inclusion in both ways
				(strpos($cid, $_cid) !== false || strpos($_cid, $cid) !== false)) ||
				(($name = $part->getName()) &&
				(strpos($name, $_cid) !== false || strpos($_cid, $name) !== false)))
			{
				// if we have a direct match, dont search any further
				if ($cid == $_cid)
				{
					$attachment = $part;
				}
				// everything else we only consider after we checked all
				if (!isset($attachment)) $attachment = $part;
				// do we want content fetched, can be done later, if not needed
				if (isset($_stream))
				{
					$this->fetchPartContents($_uid, $attachment, $_stream);
				}
				if (isset($attachment)) break;
			}
		}
		// set name as filename, if not set
		if ($attachment && !$attachment->getDispositionParameter('filename'))
		{
			$attachment->setDispositionParameter('filename', $attachment->getName());
		}
		// guess type, if not set
		if ($attachment && $attachment->getType() == 'application/octet-stream')
		{
			$attachment->setType(MimeMagic::filename2mime($attachment->getDispositionParameter('filename')));
		}
		//error_log(__METHOD__."($_uid, '$_cid', '$_part') returning ".array2string($attachment));
		return $attachment;
	}

	/**
	 * Fetch and add contents to a part
	 *
	 * To get contents you use $part->getContents();
	 *
	 * @param int $_uid
	 * @param Horde_Mime_Part $part
	 * @param boolean $_stream = false true return a stream, false a string
	 * @param boolean $_preserveSeen flag to preserve the seenflag by using body.peek
	 * @param string  $_mimetype to decide wether to try to fetch part as binary or not
	 * @return Horde_Mime_Part
	 */
	public function fetchPartContents($_uid, Horde_Mime_Part $part=null, $_stream=false, $_preserveSeen=false, $_mimetype=null)
	{
		if (!isset($part)) return null;//new Horde_Mime_Part;
		$encoding = null;
		$fetchAsBinary = true;
		if ($_mimetype && strtolower($_mimetype)=='message/rfc822') $fetchAsBinary = false;
		// we need to set content on structure to decode transfer encoding
		$part->setContents(
			$this->getBodyPart($_uid, $part->getMimeId(), null, $_preserveSeen, $_stream, $encoding, $fetchAsBinary),
			array('encoding' => (!$fetchAsBinary&&!$encoding?'8bit':$encoding)));

		return $part;
	}

	/**
	 * save a message in folder
	 *	throws exception on failure
	 * @todo set flags again
	 *
	 * @param string _folderName the foldername
	 * @param string|resource _header header part of message or resource with hole message
	 * @param string _body body part of message, only used if _header is NO resource
	 * @param string _flags = '\\Recent'the imap flags to set for the saved message
	 *
	 * @return the id of the message appended or exception
	 * @throws Exception\WrongUserinput
	 */
	function appendMessage($_folderName, $_header, $_body, $_flags='\\Recent')
	{
		if (!is_resource($_header))
		{
			if (stripos($_header,'message-id:')===false)
			{
				$_header = 'Message-ID: <'.self::getRandomString().'@localhost>'."\n".$_header;
			}
			//error_log(__METHOD__.' ('.__LINE__.') '."$_folderName, $_header, $_body, $_flags");
			$_header = ltrim(str_replace("\n","\r\n",$_header));
			$_header .= str_replace("\n","\r\n",$_body);
		}
		// the recent flag is the default enforced here ; as we assume the _flags is always set,
		// we default it to hordes default (Recent) (, other wise we should not pass the parameter
		// for flags at all)
		if (empty($_flags)) $_flags = '\\Recent';
		//if (!is_array($_flags) && stripos($_flags,',')!==false) $_flags=explode(',',$_flags);
		//if (!is_array($_flags)) $_flags = (array) $_flags;
		try
		{
			$dataNflags = array();
			// both methods below are valid for appending a message to a mailbox.
			// the commented version fails in retrieving the uid of the created message if the server
			// is not returning the uid upon creation, as the method in append for detecting the uid
			// expects data to be a string. this string is parsed for message-id, and the mailbox
			// searched for the message-id then returning the uid found
			//$dataNflags[] = array('data'=>array(array('t'=>'text','v'=>"$header"."$body")), 'flags'=>array($_flags));
			$dataNflags[] = array('data' => $_header, 'flags'=>array($_flags));
			$messageid = $this->icServer->append($_folderName,$dataNflags);
		}
		catch (\Exception $e)
		{
			if (self::$debug) error_log("Could not append Message: ".$e->getMessage());
			throw new Exception\WrongUserinput(lang("Could not append Message:").' '.$e->getMessage().': '.$e->details);
			//return false;
		}
		//error_log(__METHOD__.' ('.__LINE__.') '.' appended UID:'.$messageid);
		//$messageid = true; // for debug reasons only
		if ($messageid === true || empty($messageid)) // try to figure out the message uid
		{
			$list = $this->getHeaders($_folderName, $_startMessage=1, 1, 'INTERNALDATE', true, array(),null, false);
			if ($list)
			{
				if (self::$debug) error_log(__METHOD__.' ('.__LINE__.') '.' MessageUid:'.$messageid.' but found:'.array2string($list));
				$messageid = $list['header'][0]['uid'];
			}
		}
		return $messageid;
	}

	/**
	 * Get a random string of 32 chars
	 *
	 * @return string
	 */
	static function getRandomString()
	{
		return Auth::randomstring(32);
	}

	/**
	 * functions to allow access to mails through other apps to fetch content
	 * used in infolog, tracker
	 */

	/**
	 * get_mailcontent - fetches the actual mailcontent, and returns it as well defined array
	 * @param object mailClass the mailClassobject to be used
	 * @param uid the uid of the email to be processed
	 * @param partid the partid of the email
	 * @param mailbox the mailbox, that holds the message
	 * @param preserveHTML flag to pass through to getdisplayableBody, null for both text and HTML
	 * @param addHeaderSection flag to be able to supress headersection
	 * @param includeAttachments flag to be able to supress possible attachments
	 * @return array/bool with 'mailaddress'=>$mailaddress,
	 *				'subject'=>$subject,
	 *				'message'=>$message,
	 *				'attachments'=>$attachments,
	 *				'headers'=>$headers,; boolean false on failure
	 */
	static function get_mailcontent(&$mailClass,$uid,$partid='',$mailbox='', $preserveHTML = false, $addHeaderSection=true, $includeAttachments=true)
	{
			//echo __METHOD__." called for $uid,$partid <br>";
			$headers = $mailClass->getMessageHeader($uid,$partid,true,false,$mailbox);
			if (empty($headers)) return false;
			// dont force retrieval of the textpart, let mailClass preferences decide
			$bodyParts = $mailClass->getMessageBody($uid,($preserveHTML?'always_display':'only_if_no_text'),$partid,null,false,$mailbox);
			if(!isset($preserveHTML))
			{
				$html = static::getdisplayablebody(
						$mailClass,
						$mailClass->getMessageBody($uid,'always_display',$partid,null,false,$mailbox),
						true
				);

			}
			// if we do not want HTML but there is no TextRepresentation with the message itself, try converting
			if ( !$preserveHTML && $bodyParts[0]['mimeType']=='text/html')
			{
				foreach($bodyParts as $i => $part)
				{
					if ($bodyParts[$i]['mimeType']=='text/html')
					{
						$bodyParts[$i]['body'] = Mail\Html::convertHTMLToText($bodyParts[$i]['body'],$bodyParts[$i]['charSet'],true,$stripalltags=true);
						$bodyParts[$i]['mimeType']='text/plain';
					}
				}
			}
			//error_log(array2string($bodyParts));
			$attachments = $includeAttachments?$mailClass->getMessageAttachments($uid,$partid,null,true,false,true,$mailbox):array();

			if ($mailClass->isSentFolder($mailbox)) $mailaddress = $headers['TO'];
			elseif (isset($headers['FROM'])) $mailaddress = $headers['FROM'];
			elseif (isset($headers['SENDER'])) $mailaddress = $headers['SENDER'];
			if (isset($headers['CC'])) $mailaddress .= ','.$headers['CC'];
			//_debug_array(array($headers,$mailaddress));
			$subject = $headers['SUBJECT'];

			$message = self::getdisplayableBody($mailClass, $bodyParts, $preserveHTML);
			if ($preserveHTML && $mailClass->activeMimeType == 'text/plain') $message = '<pre>'.$message.'</pre>';
			$headdata = ($addHeaderSection ? self::createHeaderInfoSection($headers, '',$preserveHTML) : '');
			$message = $headdata.$message;
			//echo __METHOD__.'<br>';
			//_debug_array($attachments);
			if (is_array($attachments))
			{
				// For dealing with multiple files of the same name
				$dupe_count = $file_list = array();

				foreach ($attachments as $num => $attachment)
				{
					if ($attachment['mimeType'] == 'MESSAGE/RFC822')
					{
						//_debug_array($mailClass->getMessageHeader($uid, $attachment['partID']));
						//_debug_array($mailClass->getMessageBody($uid,'', $attachment['partID']));
						//_debug_array($mailClass->getMessageAttachments($uid, $attachment['partID']));
						$mailcontent = self::get_mailcontent($mailClass,$uid,$attachment['partID'],$mailbox);
						$headdata ='';
						if ($mailcontent['headers'])
						{
							$headdata = self::createHeaderInfoSection($mailcontent['headers'],'',$preserveHTML);
						}
						if ($mailcontent['message'])
						{
							$tempname =tempnam($GLOBALS['egw_info']['server']['temp_dir'],$GLOBALS['egw_info']['flags']['currentapp']."_");
							$attachedMessages[] = array(
								'type' => 'TEXT/PLAIN',
								'name' => $mailcontent['subject'].'.txt',
								'tmp_name' => $tempname,
							);
							$tmpfile = fopen($tempname,'w');
							fwrite($tmpfile,$headdata.$mailcontent['message']);
							fclose($tmpfile);
						}
						foreach($mailcontent['attachments'] as &$tmpval)
						{
							$attachedMessages[] = $tmpval;
						}
						unset($attachments[$num]);
					}
					else
					{
						$attachments[$num] = array_merge($attachments[$num],$mailClass->getAttachment($uid, $attachment['partID'],0,false,false));

						if (empty($attachments[$num]['attachment'])&&$attachments[$num]['cid'])
						{
							$c = $mailClass->getAttachmentByCID($uid, $attachment['cid'], $attachment['partID'],true);
							$attachments[$num]['attachment'] = $c->getContents();
						}
						// no attempt to convert, if we dont know about the charset
						if (isset($attachments[$num]['charset'])&&!empty($attachments[$num]['charset'])) {
							// we do not try guessing the charset, if it is not set
							//if ($attachments[$num]['charset']===false) $attachments[$num]['charset'] = Translation::detect_encoding($attachments[$num]['attachment']);
							Translation::convert($attachments[$num]['attachment'],$attachments[$num]['charset']);
						}
						if(in_array($attachments[$num]['name'], $file_list))
						{
							$dupe_count[$attachments[$num]['name']]++;
							$attachments[$num]['name'] = pathinfo($attachments[$num]['name'], PATHINFO_FILENAME) .
								' ('.($dupe_count[$attachments[$num]['name']] + 1).')' . '.' .
								pathinfo($attachments[$num]['name'], PATHINFO_EXTENSION);
						}
						$attachments[$num]['type'] = $attachments[$num]['mimeType'];
						$attachments[$num]['tmp_name'] = tempnam($GLOBALS['egw_info']['server']['temp_dir'],$GLOBALS['egw_info']['flags']['currentapp']."_");
						$tmpfile = fopen($attachments[$num]['tmp_name'],'w');
						fwrite($tmpfile,$attachments[$num]['attachment']);
						fclose($tmpfile);
						$file_list[] = $attachments[$num]['name'];
						unset($attachments[$num]['attachment']);
					}
				}
				if (is_array($attachedMessages)) $attachments = array_merge($attachments,$attachedMessages);
			}
			$return = array(
					'mailaddress'=>$mailaddress,
					'subject'=>$subject,
					'message'=>$message,
					'attachments'=>$attachments,
					'headers'=>$headers,
			);
			if($html)
			{
				$return['html_message'] = $html;
			}

			return $return;
	}

	/**
	 * getStandardIdentityForProfile
	 * get either the first identity out of the given identities or the one matching the profile_id
	 * @param object/array $_identities identity iterator object or array with identities from Mail\Account
	 * @param integer $_profile_id the acc_id/profileID the identity with the matching key is the standard one
	 * @return array the identity
	 */
	static function getStandardIdentityForProfile($_identities, $_profile_id)
	{
		$c = 0;
		// use the standardIdentity
		foreach($_identities as $key => $acc) {
			if ($c==0) $identity = $acc;
			//error_log(__METHOD__.__LINE__." $key == $_profile_id ");
			if ($key==$_profile_id) $identity = $acc;
			$c++;
		}
		return $identity;
	}
	/**
	 * createHeaderInfoSection - creates a textual headersection from headerobject
	 * @param array header headerarray may contain SUBJECT,FROM,SENDER,TO,CC,BCC,DATE,PRIORITY,IMPORTANCE
	 * @param string headline Text tom use for headline, if SUPPRESS, supress headline and footerline
	 * @param bool createHTML do it with HTML breaks
	 * @return string a preformatted string with the information of the header worked into it
	 */
	static function createHeaderInfoSection($header,$headline='', $createHTML = false)
	{
		$headdata = null;
		//error_log(__METHOD__.' ('.__LINE__.') '.array2string($header).function_backtrace());
		if ($header['SUBJECT']) $headdata = lang('subject').': '.$header['SUBJECT'].($createHTML?"<br />":"\n");
		if ($header['FROM']) $headdata .= lang('from').': '.self::convertAddressArrayToString($header['FROM'], $createHTML).($createHTML?"<br />":"\n");
		if ($header['SENDER']) $headdata .= lang('sender').': '.self::convertAddressArrayToString($header['SENDER'], $createHTML).($createHTML?"<br />":"\n");
		if ($header['TO']) $headdata .= lang('to').': '.self::convertAddressArrayToString($header['TO'], $createHTML).($createHTML?"<br />":"\n");
		if ($header['CC']) $headdata .= lang('cc').': '.self::convertAddressArrayToString($header['CC'], $createHTML).($createHTML?"<br />":"\n");
		if ($header['BCC']) $headdata .= lang('bcc').': '.self::convertAddressArrayToString($header['BCC'], $createHTML).($createHTML?"<br />":"\n");
		if ($header['DATE']) $headdata .= lang('date').': '.$header['DATE'].($createHTML?"<br />":"\n");
		if ($header['PRIORITY'] && $header['PRIORITY'] != 'normal') $headdata .= lang('priority').': '.$header['PRIORITY'].($createHTML?"<br />":"\n");
		if ($header['IMPORTANCE'] && $header['IMPORTANCE'] !='normal') $headdata .= lang('importance').': '.$header['IMPORTANCE'].($createHTML?"<br />":"\n");
		//if ($mailcontent['headers']['ORGANIZATION']) $headdata .= lang('organization').': '.$mailcontent['headers']['ORGANIZATION']."\
		if (!empty($headdata))
		{
			if (!empty($headline) && $headline != 'SUPPRESS') $headdata = "---------------------------- $headline ----------------------------".($createHTML?"<br />":"\n").$headdata;
			if (empty($headline)) $headdata = ($headline != 'SUPPRESS'?"--------------------------------------------------------".($createHTML?"<br />":"\n"):'').$headdata;
			$headdata .= ($headline != 'SUPPRESS'?"--------------------------------------------------------".($createHTML?"<br />":"\n"):'');
		}
		else
		{
			$headdata = ($headline != 'SUPPRESS'?"--------------------------------------------------------".($createHTML?"<br />":"\n"):'');
		}
		return $headdata;
	}

	/**
	 * Make the provided filename safe to store in the VFS
	 *
	 * Some characters found in subjects that cause problems if we try to put
	 * them as filenames (Windows) so we remove any characters that might result
	 * in additional directories, or issues on Windows.
	 *
	 * Under Windows the characters < > ? " : | \ / * are not allowed.
	 * % causes problems with VFS UI
	 *
	 * 4-byte unicode is also unwanted, as our current MySQL collation can store it
	 *
	 * We also dont want empty filenames, using lang('empty') instead.
	 *
	 * @param string $filename
	 * @return Cleaned filename, with problematic characters replaced with ' '.
	 */
	static function clean_subject_for_filename($filename)
	{
		static $filter_pattern = '$[\f\n\t\x0b\:*#?<>%"\|/\x{10000}-\x{10FFFF}\\\\]$u';
		$file = substr(trim(preg_replace($filter_pattern, ' ', $filename)), 0, 200);
		if (empty($file)) $file = lang('empty');
		return $file;
	}

	/**
	 * adaptSubjectForImport - strips subject from unwanted Characters, and does some normalization
	 * to meet expectations
	 * @param string $subject string to process
	 * @return string
	 */
	static function adaptSubjectForImport($subject)
	{
		$subject = str_replace('$$','__',($subject?$subject:lang('(no subject)')));
		$subject = str_ireplace(array('[FWD]','[',']','{','}','<','>'),array('Fwd:',' ',' ',' ',' ',' ',' '),trim($subject));
		return $subject;
	}

	/**
	 * convertAddressArrayToString - converts an mail envelope Address Array To String
	 * @param array $rfcAddressArray  an addressarray as provided by mail retieved via egw_pear....
	 * @return string a comma separated string with the mailaddress(es) converted to text
	 */
	static function convertAddressArrayToString($rfcAddressArray)
	{
		//error_log(__METHOD__.' ('.__LINE__.') '.array2string($rfcAddressArray));
		$returnAddr ='';
		if (is_array($rfcAddressArray))
		{
			foreach((array)$rfcAddressArray as $addressData) {
				//error_log(__METHOD__.' ('.__LINE__.') '.array2string($addressData));
				if($addressData['MAILBOX_NAME'] == 'NIL') {
					continue;
				}
				if(strtolower($addressData['MAILBOX_NAME']) == 'undisclosed-recipients') {
					continue;
				}
				if ($addressData['RFC822_EMAIL'])
				{
					$addressObjectA = self::parseAddressList($addressData['RFC822_EMAIL']);
				}
				else
				{
					$emailaddress = ($addressData['PERSONAL_NAME']?$addressData['PERSONAL_NAME'].' <'.$addressData['EMAIL'].'>':$addressData['EMAIL']);
					$addressObjectA = self::parseAddressList($emailaddress);
				}
				$addressObject = $addressObjectA[0];
				//error_log(__METHOD__.' ('.__LINE__.') '.array2string($addressObject));
				if (!$addressObject->valid) continue;
				//$mb =(string)$addressObject->mailbox;
				//$h = (string)$addressObject->host;
				//$p = (string)$addressObject->personal;
				$returnAddr .= (strlen($returnAddr)>0?',':'');
				//error_log(__METHOD__.' ('.__LINE__.') '.$p.' <'.$mb.'@'.$h.'>');
				try {
					$buff = imap_rfc822_write_address($addressObject->mailbox, Horde_Idna::decode($addressObject->host), $addressObject->personal);
				}
				// if Idna conversation fails, leave address unchanged
				catch (\Exception $e) {
					unset($e);
					$buff = imap_rfc822_write_address($addressObject->mailbox, $addressObject->host, $addressObject->personal);
				}
				$returnAddr .= str_replace(array('<','>','"\'','\'"'),array('[',']','"','"'),$buff);
				//error_log(__METHOD__.' ('.__LINE__.') '.' Address: '.$returnAddr);
			}
		}
		else
		{
			// do not mess with strings, return them untouched /* ToDo: validate string as Address */
			$rfcAddressArray = self::decode_header($rfcAddressArray,true);
			$rfcAddressArray = str_replace(array('<','>','"\'','\'"'),array('[',']','"','"'),$rfcAddressArray);
			if (is_string($rfcAddressArray)) return $rfcAddressArray;
		}
		return $returnAddr;
	}

	/**
	 * Merges a given content with contact data
	 *
	 * @param string $content
	 * @param array $ids array with contact id(s)
	 * @param string &$err error-message on error
	 * @return string/boolean merged content or false on error
	 */
	static function merge($content,$ids,$mimetype='')
	{
		$mergeobj = new Contacts\Merge();

		if (empty($mimetype)) $mimetype = (strlen(strip_tags($content)) == strlen($content) ?'text/plain':'text/html');
		$err = '';
		$rv = $mergeobj->merge_string($content,$ids,$err, $mimetype, array(), self::$displayCharset);
		if (empty($rv) && !empty($content) && !empty($err)) $rv = $content;
		if (!empty($err) && !empty($content) && !empty($ids)) error_log(__METHOD__.' ('.__LINE__.') '.' Merge failed for Ids:'.array2string($ids).' ContentType:'.$mimetype.' Content:'.$content.' Reason:'.array2string($err));
		return $rv;
	}

	/**
	 * Returns a string showing the size of the message/attachment
	 *
	 * @param integer $bytes
	 * @return string formatted string
	 */
	static function show_readable_size($bytes)
	{
		$bytes /= 1024;
		$type = 'k';

		if ($bytes / 1024 > 1)
		{
			$bytes /= 1024;
			$type = 'M';

			if ($bytes / 1024 > 1)
			{
				$bytes *= 10;
				settype($bytes, 'integer');
				$bytes /= 10;
				$bytes /= 1024;
				$type = 'G';
			}

		}

		if ($bytes < 10)
		{
			$bytes *= 10;
			settype($bytes, 'integer');
			$bytes /= 10;
		}
		else
			settype($bytes, 'integer');

		return $bytes . ' ' . $type ;
	}

	static function detect_qp($string)
	{
		return preg_match('/(=[0-9][A-F])|(=[A-F][0-9])|(=[A-F][A-F])|(=[0-9][0-9])[\s|=]/', $string);
	}

	/**
	 * logRunTimes
	 *	logs to the error log all parameters given; output only if self::$debugTimes is true
	 *
	 * @param int $_starttime starttime of the action measured based on microtime(true)
	 * @param int $_endtime endtime of the action measured, if not given microtime(true) is used
	 * @param string $_message message to output details or params, whatever seems neccesary
	 * @param string $_methodNline - Information where the log was taken
	 * @return void
	 */
	static function logRunTimes($_starttime,$_endtime=null,$_message='',$_methodNline='')
	{
		if (!isset($_endtime)) $_endtime = microtime(true);
		$usagetime = microtime(true) - $_starttime;
		if (self::$debugTimes) error_log($_methodNline.' took:'.number_format($usagetime,5).'(s) '.($_message?'Details:'.$_message:''));
	}

	/**
	 * check if formdata meets basic restrictions (in tmp dir, or vfs, mimetype, etc.)
	 *
	 * @param array $_formData passed by reference Array with information of name, type, file and size, mimetype may be adapted
	 * @param string $IDtoAddToFileName id to enrich the returned tmpfilename
	 * @param string $reqMimeType /(default message/rfc822, if set to false, mimetype check will not be performed
	 * @return mixed $fullPathtoFile or exception
	 *
	 * @throws Exception\WrongUserinput
	 */
	static function checkFileBasics(&$_formData, $IDtoAddToFileName='', $reqMimeType='message/rfc822')
	{
		if (parse_url($_formData['file'],PHP_URL_SCHEME) == 'egw-data') return $_formData['file'];

		//error_log(__METHOD__.__FILE__.array2string($_formData).' Id:'.$IDtoAddToFileName.' ReqMimeType:'.$reqMimeType);
		$importfailed = $tmpFileName = false;
		// ignore empty files, but allow to share vfs directories (which can have 0 size)
		if ($_formData['size'] == 0 && parse_url($_formData['file'], PHP_URL_SCHEME) != 'vfs' && is_dir($_formData['file']))
		{
			$importfailed = true;
			$alert_msg = lang("Empty file %1 ignored.", $_formData['name']);
		}
		elseif (parse_url($_formData['file'],PHP_URL_SCHEME) == 'vfs' || is_uploaded_file($_formData['file']) ||
			realpath(dirname($_formData['file'])) == realpath($GLOBALS['egw_info']['server']['temp_dir']))
		{
			// ensure existance of eGW temp dir
			// note: this is different from apache temp dir,
			// and different from any other temp file location set in php.ini
			if (!file_exists($GLOBALS['egw_info']['server']['temp_dir']))
			{
				@mkdir($GLOBALS['egw_info']['server']['temp_dir'],0700);
			}

			// if we were NOT able to create this temp directory, then make an ERROR report
			if (!file_exists($GLOBALS['egw_info']['server']['temp_dir']))
			{
				$alert_msg = 'Error:'.'<br>'
					.'Server is unable to access EGroupware tmp directory'.'<br>'
					.$GLOBALS['egw_info']['server']['temp_dir'].'<br>'
					.'Please check your configuration'.'<br>'
					.'<br>';
			}

			// sometimes PHP is very clue-less about MIME types, and gives NO file_type
			// rfc default for unknown MIME type is:
			if ($reqMimeType == 'message/rfc822')
			{
				$mime_type_default = 'message/rfc';
			}
			else
			{
				$mime_type_default = $reqMimeType;
			}
			// check the mimetype by extension. as browsers seem to report crap
			// maybe its application/octet-stream -> this may mean that we could not determine the type
			// so we check for the suffix too
			// trust vfs mime-types, trust the mimetype if it contains a method
			if ((substr($_formData['file'],0,6) !== 'vfs://' || $_formData['type'] == 'application/octet-stream') && stripos($_formData['type'],'method=')===false)
			{
				$buff = explode('.',$_formData['name']);
				$suffix = '';
				if (is_array($buff)) $suffix = array_pop($buff); // take the last extension to check with ext2mime
				if (!empty($suffix)) $sfxMimeType = MimeMagic::ext2mime($suffix);
				if (!empty($suffix) && !empty($sfxMimeType) &&
					(strlen(trim($_formData['type']))==0 || (strtolower(trim($_formData['type'])) != $sfxMimeType)))
				{
					error_log(__METHOD__.' ('.__LINE__.') '.' Data:'.array2string($_formData));
					error_log(__METHOD__.' ('.__LINE__.') '.' Form reported Mimetype:'.$_formData['type'].' but seems to be:'.$sfxMimeType);
					$_formData['type'] = $sfxMimeType;
				}
			}
			if (trim($_formData['type']) == '')
			{
				$_formData['type'] = 'application/octet-stream';
			}
			// if reqMimeType is set to false do not test for that
			if ($reqMimeType)
			{
				// so if PHP did not pass any file_type info, then substitute the rfc default value
				if (substr(strtolower(trim($_formData['type'])),0,strlen($mime_type_default)) != $mime_type_default)
				{
					if (!(strtolower(trim($_formData['type'])) == "application/octet-stream" && $sfxMimeType == $reqMimeType))
					{
						//error_log("Message rejected, no message/rfc. Is:".$_formData['type']);
						$importfailed = true;
						$alert_msg .= lang("File rejected, no %2. Is:%1",$_formData['type'],$reqMimeType);
					}
					if ((strtolower(trim($_formData['type'])) != $reqMimeType && $sfxMimeType == $reqMimeType))
					{
						$_formData['type'] = MimeMagic::ext2mime($suffix);
					}
				}
			}
			// as FreeBSD seems to have problems with the generated temp names we append some more random stuff
			$randomString = chr(rand(65,90)).chr(rand(48,57)).chr(rand(65,90)).chr(rand(48,57)).chr(rand(65,90));
			$tmpFileName = $GLOBALS['egw_info']['user']['account_id'].
				trim($IDtoAddToFileName).basename($_formData['file']).'_'.$randomString;

			if (parse_url($_formData['file'],PHP_URL_SCHEME) == 'vfs')
			{
				$tmpFileName = $_formData['file'];	// no need to store it somewhere
			}
			elseif (is_uploaded_file($_formData['file']))
			{
				move_uploaded_file($_formData['file'], $GLOBALS['egw_info']['server']['temp_dir'].'/'.$tmpFileName);	// requirement for safe_mode!
			}
			else
			{
				rename($_formData['file'], $GLOBALS['egw_info']['server']['temp_dir'].'/'.$tmpFileName);
			}
		} else {
			//error_log("Import of message ".$_formData['file']." failes to meet basic restrictions");
			$importfailed = true;
			$alert_msg = lang("Processing of file %1 failed. Failed to meet basic restrictions.",$_formData['name']);
		}
		if ($importfailed == true)
		{
			throw new Exception\WrongUserinput($alert_msg);
		}
		else
		{
			if (parse_url($tmpFileName,PHP_URL_SCHEME) == 'vfs')
			{
				Vfs::load_wrapper('vfs');
			}
			return $tmpFileName;
		}
	}

	/**
	 * Parses a html text for images, and adds them as inline attachment
	 *
	 * Images can be data-urls, own VFS webdav.php urls or absolute path.
	 *
	 * @param Mailer $_mailObject instance of the Mailer Object to be used
	 * @param string $_html2parse the html to parse and to be altered, if conditions meet
	 * @param $mail_bo mail bo object
	 * @return array|null return inline images stored as tmp file in vfs as array of attachments otherwise null
	 */
	static function processURL2InlineImages(Mailer $_mailObject, &$_html2parse, $mail_bo)
	{
		//error_log(__METHOD__."()");
		$imageC = 0;
		$images = null;
		$attachments = null;

		if (preg_match_all("/(src|background)=\"(.*)\"/Ui", $_html2parse, $images) && isset($images[2]))
		{
			foreach($images[2] as $i => $url)
			{
				//$isData = false;
				$basedir = $data = '';
				$needTempFile = true;
				$attachmentData = ['name' => '', 'type' => '', 'file' => '', 'tmp_name' => ''];
				try
				{
					// do not change urls for absolute images (thanks to corvuscorax)
					if (!str_starts_with($url, 'data:'))
					{
						$attachmentData['name'] = basename($url); // need to resolve all sort of url
						if (($directory = dirname($url)) == '.') $directory = '';
						$ext = pathinfo($attachmentData['name'], PATHINFO_EXTENSION);
						$attachmentData['type'] = MimeMagic::ext2mime($ext);
						if ( strlen($directory) > 1 && !str_ends_with($directory, '/')) { $directory .= '/'; }

						//decode entities because tinymce encodes (e.g. Umlautes) them otherwise file can't be found.
						$myUrl = html_entity_decode($directory.$attachmentData['name']);

						if ($myUrl[0]=='/') // local path -> we only allow path's that are available via http/https (or vfs)
						{
							$basedir = Framework::getUrl('/');
						}
						// use vfs instead of url containing webdav.php
						// ToDo: we should test if the webdav url is of our own scope, as we cannot handle foreign
						// webdav.php urls as vfs
						if (str_contains($myUrl, '/webdav.php')) // we have a webdav link, so we build a vfs/sqlfs link of it.
						{
							Vfs::load_wrapper('vfs');
							list(,$myUrl) = explode('/webdav.php',$myUrl,2);
							$basedir = 'vfs://default';
							$needTempFile = false;
						}

						// If it is an inline image url, we need to fetch the actuall attachment
						// content and later on to be able to store its content as temp file
						if ($mail_bo && str_contains($myUrl, '/index.php?menuaction=mail.mail_ui.displayImage'))
						{
							$URI_params = array();
							// Strips the url and store it into a temp for further procss
							$tmp_url = html_entity_decode($myUrl);

							parse_str(parse_url($tmp_url, PHP_URL_QUERY),$URI_params);
							if ($URI_params['mailbox'] && $URI_params['uid'] && $URI_params['cid'])
							{
								$mail_bo->reopen(base64_decode($URI_params['mailbox']));
								$attachment = $mail_bo->getAttachmentByCID(base64_decode($URI_params['uid']), base64_decode($URI_params['cid']),base64_decode($URI_params['partID']),true);
								$mail_bo->closeConnection();
								if ($attachment)
								{
									$data = $attachment->getContents();
									$attachmentData['type'] = $attachment->getType();
									$attachmentData['name'] = $attachment->getDispositionParameter('filename');
								}
							}
						}

						if ( $myUrl[0]!='/' && strlen($basedir) > 1 && !str_ends_with($basedir, '/')) { $basedir .= '/'; }
						if ($needTempFile && empty($attachment) && !str_starts_with($myUrl, "http")) $data = file_get_contents($basedir.urldecode($myUrl));
					}
					if (str_starts_with($url, 'data:'))
					{
						//error_log(__METHOD__.' ('.__LINE__.') '.' -> '.$i.': '.array2string($images[$i]));
						// we only support base64 encoded data
						$tmp = substr($url,strlen('data:'));
						list($attachmentData['type'],$data_base64) = explode(';base64,',$tmp);
						$data = base64_decode($data_base64);
						// FF currently does NOT add any mime-type
						if (strtolower(substr($attachmentData['type'], 0, 6)) != 'image/')
						{
							$attachmentData['type'] = MimeMagic::analyze_data($data);
						}
						list($what,$exactly) = explode('/',$attachmentData['type']);
						$needTempFile = true;
						$attachmentData['name'] = ($what ?: 'data').$imageC++.'.'.$exactly;
					}
					if ($data || $needTempFile === false)
					{
						if ($needTempFile)
						{
							$attachmentData['file'] =tempnam($GLOBALS['egw_info']['server']['temp_dir'],$GLOBALS['egw_info']['flags']['currentapp']."_");
							$tmpfile = fopen($attachmentData['file'],'w');
							fwrite($tmpfile,$data);
							fclose($tmpfile);
						}
						else
						{
							$attachmentData['file'] = $basedir.urldecode($myUrl);
						}
						// we use $attachmentData['file'] as base for cid instead of filename, as it may be image.png
						// (or similar) in all cases (when cut&paste). This may lead to more attached files, in case
						// we use the same image multiple times, but, if we do this, we should try to detect that
						// on upload. filename itself is not sufficient to determine the sameness of images
						$cid = 'cid:' . md5($attachmentData['file']);
						if ($_mailObject->AddEmbeddedImage($attachmentData['file'], substr($cid, 4), urldecode($attachmentData['file']), $attachmentData['type']) !== null)
						{
							//$_html2parse = preg_replace("/".$images[1][$i]."=\"".preg_quote($url, '/')."\"/Ui", $images[1][$i]."=\"".$cid."\"", $_html2parse);
							$_html2parse = str_replace($images[0][$i], $images[1][$i].'="'.$cid.'"', $_html2parse);
						}
					}
				}
				catch(\Exception $e)
				{
					// Something went wrong with this attachment.  Skip it.
					error_log("Error adding inline attachment.  " . $e->getMessage());
					error_log($e->getTraceAsString());
				}
				$attachmentData['tmp_name'] = $attachmentData['file'];
				$attachments [] = $attachmentData;
			}
			return is_array($attachments) ? $attachments : null;
		}
	}

	/**
	 * importMessageToMergeAndSend
	 *
	 * @param Storage\Merge Storage\Merge bo_merge object
	 * @param string $document the full filename
	 * @param array $SendAndMergeTocontacts array of contact ids
	 * @param string&|false $_folder (passed by reference) will set the folder used. must be set with a folder, but will hold modifications if
	 *					folder is modified.  Set to false to not keep the message.
	 * @param string& $importID ID for the imported message, used by attachments to identify them unambiguously
	 * @return mixed array of messages with success and failed messages or exception
	 */
	function importMessageToMergeAndSend(Storage\Merge $bo_merge, $document, $SendAndMergeTocontacts, &$_folder, &$importID='')
	{
		$importfailed = false;
		$processStats = array('success'=>array(),'failed'=>array());
		if (empty($SendAndMergeTocontacts))
		{
			$importfailed = true;
			$alert_msg = lang("Import of message %1 failed. No Contacts to merge and send to specified.", '');
		}

		// check if formdata meets basic restrictions (in tmp dir, or vfs, mimetype, etc.)
		/* as the file is provided by Storage\Merge, we do not check
		try
		{
			$tmpFileName = Mail::checkFileBasics($_formData,$importID);
		}
		catch (\Exception\WrongUserinput $e)
		{
			$importfailed = true;
			$alert_msg .= $e->getMessage();
		}
		*/
		$tmpFileName = $document;
		// -----------------------------------------------------------------------
		if ($importfailed === false)
		{
			$mailObject = new Mailer($this->profileID);
			try
			{
				$this->parseFileIntoMailObject($mailObject, $tmpFileName);
			}
			catch (Exception\AssertionFailed $e)
			{
				$importfailed = true;
				$alert_msg .= $e->getMessage();
			}

			//_debug_array($Body);
			$this->openConnection();
			if (empty($_folder) && $_folder !== FALSE)
			{
				$_folder = $this->getSentFolder();
			}
			$delimiter = $this->getHierarchyDelimiter();
			if($_folder=='INBOX'.$delimiter) $_folder='INBOX';
			if ($importfailed === false)
			{
				$Subject = $mailObject->getHeader('Subject');
				//error_log(__METHOD__.' ('.__LINE__.') '.' Subject:'.$Subject);
				$Body = ($text_body = $mailObject->findBody('plain')) ? $text_body->getContents() : null;
				//error_log(__METHOD__.' ('.__LINE__.') '.' Body:'.$Body);
				//error_log(__METHOD__.' ('.__LINE__.') '.' BodyContentType:'.$mailObject->BodyContentType);
				$AltBody = ($html_body = $mailObject->findBody('html')) ? $html_body->getContents() : null;
				//error_log(__METHOD__.' ('.__LINE__.') '.' AltBody:'.$AltBody);
				//error_log(__METHOD__.' ('.__LINE__.') '.array2string($mailObject->GetReplyTo()));

				if(!$Body && !$AltBody)
				{
					throw new Exception\NotFound('No mail body in template "'.$document.'"');
				}

				// Fetch ReplyTo - Address if existing to check if we are to replace it
				$replyTo = $mailObject->getReplyTo();
				if (isset($replyTo['replace@import.action']))
				{
					$mailObject->clearReplyTos();
					$activeMailProfiles = $this->mail->getAccountIdentities($this->profileID);
					$activeMailProfile = self::getStandardIdentityForProfile($activeMailProfiles,$this->profileID);

					$mailObject->addReplyTo(Horde_Idna::encode($activeMailProfile['ident_email']),Mail::generateIdentityString($activeMailProfile,false));
				}
				if(count($SendAndMergeTocontacts) > 1)
				{
					foreach(Mailer::$type2header as $type => $h)
					{
						$header = $mailObject->getHeader(Mailer::$type2header[$type]);
						if(is_array($header)) $header = implode(', ',$header);
						$headers[$type] = $header;
					}
				}
				foreach ($SendAndMergeTocontacts as $k => $val)
				{
					$errorInfo = $email = '';
					$sendOK = $openComposeWindow = $openAsDraft = null;
					//error_log(__METHOD__.' ('.__LINE__.') '.' Id To Merge:'.$val);
					if (/*$GLOBALS['egw_info']['flags']['currentapp'] == 'addressbook' &&*/
						(count($SendAndMergeTocontacts) > 1 || $_folder === FALSE) && $val &&
						(is_numeric($val) || $GLOBALS['egw']->accounts->name2id($val))) // do the merge
					{
						//error_log(__METHOD__.' ('.__LINE__.') '.array2string($mailObject));

						// Parse destinations for placeholders
						foreach(Mailer::$type2header as $type => $h)
						{
							//error_log('ID ' . $val . ' ' .$type . ': ' . $mailObject->getHeader(Mailer::$type2header[$type]) . ' -> ' .$bo_merge->merge_string($mailObject->getHeader(Mailer::$type2header[$type]),$val,$e,'text/plain',array(),self::$displayCharset));
							$merged = $bo_merge->merge_string($headers[$type],$val,$e,'text/plain',array(),self::$displayCharset);
							$mailObject->clearAddresses($type);
							$mailObject->addAddress($merged,'',$type);
							if($type == 'to')
							{
								$email = $merged;
							}
						}

						// No addresses from placeholders?  Treat it as just a contact ID
						if (!$email)
						{
							$contact = $bo_merge->contacts->read($val);
							//error_log(__METHOD__.' ('.__LINE__.') '.' ID:'.$val.' Data:'.array2string($contact));
							$email = ($contact['email'] ? $contact['email'] : $contact['email_home']);
							$nfn = ($contact['n_fn'] ? $contact['n_fn'] : $contact['n_given'].' '.$contact['n_family']);
							if($email)
							{
								$mailObject->addAddress(Horde_Idna::encode($email), $nfn);
							}
						}

						$activeMailProfiles = $this->getAccountIdentities($this->profileID);
						$activeMailProfile = self::getStandardIdentityForProfile($activeMailProfiles,$this->profileID);
						//error_log(__METHOD__.' ('.__LINE__.') '.array2string($activeMailProfile));
						$mailObject->setFrom($activeMailProfile['ident_email'],
							self::generateIdentityString($activeMailProfile,false));

						$mailObject->removeHeader('Message-ID');
						$mailObject->removeHeader('Date');
						$mailObject->clearCustomHeaders();
						$mailObject->addHeader('Subject', $bo_merge->merge_string($Subject, $val, $e, 'text/plain', array(), self::$displayCharset));
						//error_log(__METHOD__.' ('.__LINE__.') '.' ContentType:'.$mailObject->BodyContentType);
						if($text_body) $text_body->setContents($bo_merge->merge_string($Body, $val, $e, 'text/plain', array(), self::$displayCharset),array('encoding'=>Horde_Mime_Part::DEFAULT_ENCODING));
						//error_log(__METHOD__.' ('.__LINE__.') '.' Result:'.$mailObject->Body.' error:'.array2string($e));
						if($html_body) $html_body->setContents($bo_merge->merge_string($AltBody, $val, $e, 'text/html', array(), self::$displayCharset),array('encoding'=>Horde_Mime_Part::DEFAULT_ENCODING));

						//error_log(__METHOD__.' ('.__LINE__.') '.array2string($mailObject));
						// set a higher timeout for big messages
						@set_time_limit(120);
						$sendOK = true;
						try {
							$mailObject->send();
							$message_id = $mailObject->getHeader('Message-ID');
							if($_folder)
							{
								$id = $this->appendMessage($_folder, $mailObject->getRaw(), '');
								$importID = $id->current();
							}
						}
						catch(Exception $e) {
							$sendOK = false;
							$errorInfo = $e->getMessage();
							//error_log(__METHOD__.' ('.__LINE__.') '.array2string($errorInfo));
						}
					}
					elseif (!$k)	// 1. entry, further entries will fail for apps other then addressbook
					{
						$openAsDraft = true;
						$mailObject->removeHeader('Message-ID');
						$mailObject->removeHeader('Date');
						$mailObject->clearCustomHeaders();

						// Parse destinations for placeholders
						foreach(Mailer::$type2header as $type => $h)
						{
							$header = $mailObject->getHeader(Mailer::$type2header[$type]);
							if(is_array($header)) $header = implode(', ',$header);
							$mailObject->clearAddresses($type);
							$merged = $bo_merge->merge_string($header,$val,$e,'text/plain',array(),self::$displayCharset);
							//error_log($type . ': ' . $mailObject->getHeader(Mailer::$type2header[$type]) . ' -> ' .$merged);
							$mailObject->addAddress(trim($merged,'"'),'',$type);
						}
						$mailObject->forceBccHeader();

						// No addresses from placeholders?  Treat it as just a contact ID
						if (count($mailObject->getAddresses('to',true)) == 0 &&
							is_numeric($val) || $GLOBALS['egw']->accounts->name2id($val)) // do the merge
						{
							$contact = $bo_merge->contacts->read($val);
							//error_log(__METHOD__.' ('.__LINE__.') '.array2string($contact));
							$email = ($contact['email'] ? $contact['email'] : $contact['email_home']);
							$nfn = ($contact['n_fn'] ? $contact['n_fn'] : $contact['n_given'].' '.$contact['n_family']);
							if($email)
							{
								$mailObject->addAddress(Horde_Idna::encode($email), $nfn);
							}
						}
						$mailObject->addHeader('Subject', $bo_merge->merge_string($Subject, $val, $e, 'text/plain', array(), self::$displayCharset));
						//error_log(__METHOD__.' ('.__LINE__.') '.' ContentType:'.$mailObject->BodyContentType);
						if (!empty($Body)) $text_body->setContents($bo_merge->merge_string($Body, $val, $e, 'text/plain', array(), self::$displayCharset),array('encoding'=>Horde_Mime_Part::DEFAULT_ENCODING));
						//error_log(__METHOD__.' ('.__LINE__.') '.' Result:'.$mailObject->Body.' error:'.array2string($e));
						if (!empty($AltBody)) $html_body->setContents($bo_merge->merge_string($AltBody, $val, $e, 'text/html', array(), self::$displayCharset),array('encoding'=>Horde_Mime_Part::DEFAULT_ENCODING));
						if(!$_folder !== false)
						{
							$_folder = $this->getDraftFolder();
						}
					}
					if ($sendOK || $openAsDraft)
					{
						if ($openAsDraft)
						{
							if($this->folderExists($_folder,true))
							{
								if($this->isSentFolder($_folder))
								{
									$flags = '\\Seen';
								} elseif($this->isDraftFolder($_folder)) {
									$flags = '\\Draft';
								} else {
									$flags = '';
								}
								$savefailed = false;
								try
								{
									$messageUid =$this->appendMessage($_folder,
										$mailObject->getRaw(),
										null,
										$flags);
								}
								catch (\Exception\WrongUserinput $e)
								{
									$savefailed = true;
									$alert_msg .= lang("Save of message %1 failed. Could not save message to folder %2 due to: %3",$Subject,$_folder,$e->getMessage());
								}
								// no send, save successful, and message_uid present
								if ($savefailed===false && $messageUid && !isset($sendOK))
								{
									$importID = $messageUid;
									$openComposeWindow = true;
								}
							}
							else if ($_folder !== FALSE)
							{
								$savefailed = true;
								$alert_msg .= lang("Saving of message %1 failed. Destination Folder %2 does not exist.",$Subject,$_folder);
							}
						}
						if ($sendOK)
						{
							$processStats['success'][$val] = 'Send succeeded to '.$nfn.'<'.$email.'>'.($savefailed?' but failed to store to Folder:'.$_folder:'');
						}
						else
						{
							if (!$openComposeWindow) $processStats['failed'][$val] = $errorInfo?$errorInfo:'Send failed to '.$nfn.'<'.$email.'> See error_log for details';
						}
					}
					if (isset($sendOK) && $sendOK===false && !isset($openComposeWindow))
					{
						$processStats['failed'][$val] = $errorInfo?$errorInfo:'Send failed to '.$nfn.'<'.$email.'> See error_log for details';
					}
				}
			}
			unset($mailObject);
		}
		// set the url to open when refreshing
		if ($importfailed == true)
		{
			throw new Exception\WrongUserinput($alert_msg);
		}
		else
		{
			//error_log(__METHOD__.' ('.__LINE__.') '.array2string($processStats));
			return $processStats;
		}
	}

	/**
	 * functions to allow the parsing of message/rfc files
	 * used in felamimail to import mails, or parsev a message from file enrich it with addressdata (merge) and send it right away.
	 */

	/**
	 * Parses a message/rfc mail from file to the mailobject
	 *
	 * @param object $mailer instance of the SMTP Mailer Object
	 * @param string $tmpFileName string that points/leads to the file to be imported
	 * @throws Exception\NotFound if $fle is not found
	 */
	function parseFileIntoMailObject(Mailer $mailer, $tmpFileName)
	{
		switch (parse_url($tmpFileName, PHP_URL_SCHEME))
		{
			case 'vfs':
				break;
			case 'egw-data':
				$message = ($host = parse_url($tmpFileName, PHP_URL_HOST)) ? Link::get_data($host, true) : false;
				break;
			default:
				$tmpFileName = $GLOBALS['egw_info']['server']['temp_dir'].'/'.basename($tmpFileName);
				break;
		}
		if (!isset($message)) $message = fopen($tmpFileName, 'r');

		if (!$message)
		{
			throw new Exception\NotFound("File '$tmpFileName' not found!");
		}
		$this->parseRawMessageIntoMailObject($mailer, $message);

		fclose($message);
	}

	/**
	 * Check and fix headers of raw message for headers with line width
	 * more than 998 chars per line, as none folding long headers might
	 * break the mail content. RFC 2822 (2.2.3 Long Header fields)
	 * https://www.ietf.org/rfc/rfc2822.txt
	 *
	 * @param string|resource $message
	 * @return string
	 */
	static private function _checkAndfixLongHeaderFields($message)
	{
		$eol = Horde_Mime_Part::RFC_EOL.Horde_Mime_Part::RFC_EOL;
		$needsFix = false;
		if (is_resource($message))
		{
			fseek($message, 0, SEEK_SET);
			$m = '';
			while (!feof($message)) {
				$m .= fread($message, 8192);
			}
			$message = $m;
		}

		if (is_string($message))
		{
			$start = substr($message,0, strpos($message, $eol));
			$body = substr($message, strlen($start));
			$hlength = strpos($start, $eol) ? strpos($start, $eol) : strlen($start);
			$headers = Horde_Mime_Headers::parseHeaders(substr($start, 0,$hlength));
			foreach($headers->toArray() as $header => $value)
			{
				$needsReplacement = false;
				foreach((array)$value as $val)
				{
					if (strlen($val)+ strlen($header) > 900)
					{
						$needsReplacement = $needsFix = true;
					}
				}
				if ($needsReplacement) {
					$headers->removeHeader($header);
					$headers->addHeader($header, $value);
				}
			}
		}
		return $needsFix ? ($headers->toString(array('canonical'=>true)).$body) : $message;
	}

	/**
	 * Parses a message/rfc mail from file to the mailobject
	 *
	 * @param Mailer $mailer instance of SMTP Mailer object
	 * @param string|ressource|Horde_Mime_Part $message string or resource containing the RawMessage / object Mail_mimeDecoded message (part))
	 * @param boolean $force8bitOnPrimaryPart (default false. force transferEncoding and charset to 8bit/utf8 if we have a textpart as primaryPart)
	 * @throws Exception\WrongParameter when the required Horde_Mail_Part not found
	 */
	function parseRawMessageIntoMailObject(Mailer $mailer, $message, $force8bitOnPrimaryPart=false)
	{
		if (is_string($message) || is_resource($message))
		{
			// Check and fix long header fields
			$message = self::_checkAndfixLongHeaderFields($message);

			// Default charset to utf-8, not us-ascii which Horde chooses
			Horde_Mime_Part::$defaultCharset = 'utf-8';

			$structure = Horde_Mime_Part::parseMessage($message);
			//error_log(__METHOD__.__LINE__.'#'.$structure->getPrimaryType().'#');
			if ($force8bitOnPrimaryPart&&$structure->getPrimaryType()=='text')
			{
				$structure->setTransferEncoding('8bit');
				$structure->setCharset('utf-8');
			}
			$mailer->setBasePart($structure);
			//error_log(__METHOD__.__LINE__.':'.array2string($structure));

			// unfortunately parseMessage does NOT return parsed headers (we assume header is shorter then 8k)
			// *** increase the header size limit to 32k to make sure most of the mails even with huge headers are
			// covered. TODO: Not sure if we even need to cut of the header parts and not just passing the whole
			// message to be parsed in order to get all headers, it needs more invetigation.
			$start = is_string($message) ? substr($message, 0, 32768) :
				(fseek($message, 0, SEEK_SET) == -1 ? '' : fread($message, 32768));

			$length = strpos($start, Horde_Mime_Part::RFC_EOL.Horde_Mime_Part::RFC_EOL);
			if ($length===false) $length = strlen($start);
			$headers = Horde_Mime_Headers::parseHeaders(substr($start, 0,$length));

			foreach($headers->toArray(array('nowrap' => true)) as $header => $value)
			{
				foreach((array)$value as $n => $val)
				{
					$overwrite = !$n;
					switch($header)
					{
						case 'Content-Transfer-Encoding':
							//as we parse the message and this sets the part with a Content-Transfer-Encoding, we
							//should not overwrite it with the header-values of the source-message as the encoding
							//may be altered when retrieving the message e.g. from server
							//error_log(__METHOD__.__LINE__.':'.$header.'->'.$val.'<->'.$mailer->getHeader('Content-Transfer-Encoding'));
							break;
						case 'Bcc':
						case 'bcc':
							//error_log(__METHOD__.__LINE__.':'.$header.'->'.$val);
							$mailer->addBcc($val);
							break;
						default:
							//error_log(__METHOD__.__LINE__.':'.$header.'->'.$val);
							$mailer->addHeader($header, $val, $overwrite);
							//error_log(__METHOD__.__LINE__.':'.'getHeader('.$header.')'.array2string($mailer->getHeader($header)));
					}
				}
			}
		}
		elseif (is_a($message, 'Horde_Mime_Part'))
		{
			$mailer->setBasePart($message);
		}
		else
		{
			if (($type = gettype($message)) == 'object') $type = get_class ($message);
			throw new Exception\WrongParameter('Wrong parameter type for message: '.$type);
		}
	}

	/**
	 * Parse an address-list
	 *
	 * Replaces imap_rfc822_parse_adrlist, which fails for utf-8, if not our replacement in common_functions is used!
	 *
	 * @param string $addresses
	 * @param string $default_domain
	 * @return Horde_Mail_Rfc822_List iteratable Horde_Mail_Rfc822_Address objects with attributes mailbox, host, personal and valid
	 */
	public static function parseAddressList($addresses, $default_domain=null)
	{
		$rfc822 = new Horde_Mail_Rfc822();
		$ret = $rfc822->parseAddressList($addresses, $default_domain ? array('default_domain' => $default_domain) : array());
		//error_log(__METHOD__.__LINE__.'#'.array2string($addresses).'#'.array2string($ret).'#'.$ret->count().'#'.$ret->count.function_backtrace());
		if ((empty($ret) || $ret->count()==0)&& is_string($addresses) && strlen($addresses)>0)
		{
			$matches = array();
			preg_match_all("/[\w\.,-.,_.,0-9.]+@[\w\.,-.,_.,0-9.]+/",$addresses,$matches);
			//error_log(__METHOD__.__LINE__.array2string($matches));
			foreach ($matches[0] as &$match) {$match = trim($match,', ');}
			$addresses = implode(',',$matches[0]);
			//error_log(__METHOD__.__LINE__.array2string($addresses));
			$ret = $rfc822->parseAddressList($addresses, $default_domain ? array('default_domain' => $default_domain) : array());
			//error_log(__METHOD__.__LINE__.'#'.array2string($addresses).'#'.array2string($ret).'#'.$ret->count().'#'.$ret->count);
		}
		$previousFailed=false;
		$ret2 = new Horde_Mail_Rfc822_List();
		// handle known problems on emailaddresses
		foreach($ret as $i => $adr)
		{
			//mailaddresses enclosed in single quotes like 'me@you.com' show up as 'me as mailbox and you.com' as host
			if ($adr->mailbox && stripos($adr->mailbox,"'")== 0 &&
					$adr->host && stripos($adr->host,"'")== (strlen($adr->host) -1))
			{
				$adr->mailbox = str_replace("'","",$adr->mailbox);
				$adr->host = str_replace("'","",$adr->host);
			}


			// try to strip extra quoting or slashes from personal part
			$adr->personal = stripslashes($adr->personal);
			if ($adr->personal && (stripos($adr->personal, '"') == 0 &&
					substr($adr->personal, -1) == '"') ||
					(substr($adr->personal, -2) == '""'))
			{
				$adr->personal = str_replace('"', "", $adr->personal);
			}


			// no mailbox or host part as 'Xr\xc3\xa4hlyz, User <mailboxpart1.mailboxpart2@yourhost.com>' is parsed as 2 addresses separated by ','
			//#'Xr\xc3\xa4hlyz, User <mailboxpart1.mailboxpart2@yourhost.com>'
			//#Horde_Mail_Rfc822_List Object([_data:protected] => Array(
			//[0] => Horde_Mail_Rfc822_Address Object([comment] => Array()[mailbox] => Xr\xc3\xa4hlyz[_host:protected] => [_personal:protected] => )
			//[1] => Horde_Mail_Rfc822_Address Object([comment] => Array()[mailbox] => mailboxpart1.mailboxpart2[_host:protected] => youthost.com[_personal:protected] => User))[_filter:protected] => Array()[_ptr:protected] => )#2#,
			if (strlen($adr->mailbox)==0||strlen($adr->host)==0)
			{
				$remember = ($adr->mailbox?$adr->mailbox:($adr->host?$adr->host:''));
				$previousFailed=true;
				//error_log(__METHOD__.__LINE__."('$addresses', $default_domain) parsed $i: mailbox=$adr->mailbox, host=$adr->host, personal=$adr->personal");
			}
			else
			{
				if ($previousFailed && $remember) $adr->personal = $remember. ' ' . $adr->personal;
				$remember = '';
				$previousFailed=false;
				//error_log(__METHOD__.__LINE__."('$addresses', $default_domain) parsed $i: mailbox=$adr->mailbox, host=$adr->host, personal=$adr->personal");
				$ret2->add($adr);
			}
		}
		//error_log(__METHOD__.__LINE__.'#'.array2string($addresses).'#'.array2string($ret2).'#'.$ret2->count().'#'.$ret2->count);
		return $ret2;
	}

	/**
	 * Send a read notification
	 *
	 * @param string $uid
	 * @param string $_folder
	 * @return boolean
	 */
	function sendMDN($uid,$_folder)
	{
		$acc = Mail\Account::read($this->profileID);
		$identity = Mail\Account::read_identity($acc['ident_id'], true, null, $acc);
		if (self::$debug) error_log(__METHOD__.__LINE__.array2string($identity));
		$headers = $this->getMessageHeader($uid, '', 'object', true, $_folder);

		// check we have an email to send the mdn to (otherwise Horde_Mime_Mdn throws a RuntimeException)
		if (empty($mdn_to = $headers[strtoupper('Disposition-Notification-To')]) || strpos($mdn_to, '@') === false)
		{
			return false;
		}

		// Override Horde's translation with our own
		Horde_Translation::setHandler('Horde_Mime', new Horde_Translation_Handler_Gettext('Horde_Mime', EGW_SERVER_ROOT.'/api/lang/locale'));
		Preferences::setlocale();

		$mdn = new Horde_Mime_Mdn($headers);
		$mdn->generate(true, true, 'displayed', php_uname('n'), $acc->smtpTransport(), array(
			'charset' => 'utf-8',
			'from_addr' => self::generateIdentityString($identity),
		));

		return true;
	}

	/**
	 * Hook stuff
	 */

	/**
	 * hook to add account
	 *
	 * this function is a wrapper function for emailadmin
	 *
	 * @param _hookValues contains the hook values as array
	 * @return nothing
	 */
	function addAccount($_hookValues)
	{
		error_log(__METHOD__.' ('.__LINE__.') '.' NOT DONE YET!' . ' hookValue = '. $_hookValues);

	}

	/**
	 * hook to delete account
	 *
	 * this function is a wrapper function for emailadmin
	 *
	 * @param _hookValues contains the hook values as array
	 * @return nothing
	 */
	function deleteAccount($_hookValues)
	{
		error_log(__METHOD__.' ('.__LINE__.') '.' NOT DONE YET!' . ' hookValue = '. $_hookValues);

	}

	/**
	 * hook to update account
	 *
	 * this function is a wrapper function for emailadmin
	 *
	 * @param _hookValues contains the hook values as array
	 * @return nothing
	 */
	function updateAccount($_hookValues)
	{
		error_log(__METHOD__.' ('.__LINE__.') '.' NOT DONE YET!' . ' hookValue = '. $_hookValues);

	}

	/**
	 * This function gets array of email addresses in RFC822 format
	 * and tries to normalize the addresses into only email addresses.
	 *
	 * @param array $_addresses Addresses
	 */
	static function stripRFC822Addresses ($_addresses)
	{
		$matches = array();
		foreach ($_addresses as &$address)
		{
			preg_match("/<([^\'\" <>]+)>$/", $address, $matches);
			if (!empty($matches[1])) $address = $matches[1];
		}
		return $_addresses;
	}



	/**
	 * Resolve certificate and encrypted message from smime attachment
	 *
	 * @param Horde_Mime_Part $_mime_part
	 * @param array $_params
	 *		params = array (
	 *			mimeType			=> (string) // message mime type
	 *			uid					=> (string) // message uid
	 *			mailbox				=> (string) // the mailbox where message is stored
	 *			passphrase			=> (string) // smime private key passphrase
	 *		)
	 *
	 * @return Horde_Mime_Part returns a resolved mime part
	 * @throws PassphraseMissing if private key passphrase is not provided
	 * @throws Horde_Crypt_Exception if decryption fails
	 */
	function resolveSmimeMessage(Horde_Mime_Part $_mime_part, $_params)
	{
		// default params
		$params = array_merge(array(
 			'passphrase'	=> ''
		), $_params);

		$metadata = array (
			 'mimeType' => $params['mimeType']?$params['mimeType']:$_mime_part->getType()
		);
		$this->smime = new Mail\Smime;
		$message = $this->getMessageRawBody($params['uid'], null, $params['mailbox']);
		if (!Mail\Smime::isSmimeSignatureOnly(Mail\Smime::getSmimeType($_mime_part)))
		{
			try{
				$message = $this->_decryptSmimeBody($message, $params['passphrase'] !='' ?
						$params['passphrase'] : Api\Cache::getSession('mail', 'smime_passphrase'));
			}
			catch(\Horde_Crypt_Exception $e)
			{
				throw new Mail\Smime\PassphraseMissing(lang('Could not decrypt '.
						'S/MIME data. This message may not be encrypted by your '.
						'public key and not being able to find corresponding private key.'));
			}
			$metadata['encrypted'] = true;
		}

		try {
			$cert = $this->smime->verifySignature($message);
		} catch (\Exception $ex) {
			// passphrase is required to decrypt the message
			if (isset($message['password_required']))
			{
				throw new Mail\Smime\PassphraseMissing($message['msg']);
			}
			// verifivation failure either message has been tempered,
			// signature is not valid or message has not ben signed
			// but encrypted only.
			else
			{
				$metadata['verify'] = false;
				$metadata['signed'] = true;
				$metadata['msg'] = $ex->getMessage();
			}
		}

		if ($cert) // signed message, it might be encrypted too
		{
			$envelope = $this->getMessageEnvelope($params['uid'], '', false, $params['mailbox']);
			$from = $this->stripRFC822Addresses($envelope['FROM']);
			$message_parts = $this->smime->extractSignedContents($message);
			$cert_email = strtolower($cert->email);
			//$f = $message_parts->_headers->getHeader('from');
			$metadata = array_merge ($metadata, array (
				'verify'		=> $cert->verify,
				'cert'			=> $cert->cert,
				'certDetails'	=> $this->smime->parseCert($cert->cert),
				'msg'			=> $cert->msg,
				'certHtml'		=> $this->smime->certToHTML($cert->cert),
				'email'			=> $cert_email,
				'signed'		=> true
			));
			// check for email address if both signer email address and
			// email address of sender are the same. It also takes  subjectAltName emails into account.
			if (is_array($from) && strcasecmp($from[0], $cert_email) != 0
					&& stripos($metadata['certDetails']['extensions']['subjectAltName'],$from[0]) === false)
			{
				$metadata['unknownemail'] = true;
				$metadata['msg'] .= ' '.lang('Email address of signer is different from the email address of sender!');
			}

			$AB_bo   = new \addressbook_bo();
			$certkey = $AB_bo->get_smime_keys($cert_email);
			if (!is_array($certkey) || strcasecmp(trim($certkey[$cert_email]), trim($cert->cert)) != 0) $metadata['addtocontact'] = true;
		}
		else // only encrypted message
		{
			$message_parts = Horde_Mime_Part::parseMessage($message, array('forcemime' => true));
		}
		$message_parts->setMetadata('X-EGroupware-Smime', $metadata);
		return $message_parts;
	}

	/**
	 * decrypt given smime encrypted message
	 *
	 * @param string $_message
	 * @param string $_passphrase
	 * @return array|string return
	 * @throws Horde_Crypt_Exception
	 */
	private function _decryptSmimeBody ($_message, $_passphrase = '')
	{
		$AB_bo   = new \addressbook_bo();
		$acc_smime = Mail\Smime::get_acc_smime($this->profileID, $_passphrase);
		$certkey = $AB_bo->get_smime_keys($acc_smime['acc_smime_username']);
		if (!$this->smime->verifyPassphrase($acc_smime['pkey'], $_passphrase))
		{
			return array (
				'password_required' => true,
				'msg' => 'Authentication failure!'
			);
		}

		$params  = array (
			'type'      => 'message',
			'pubkey'    => $certkey[strtolower($acc_smime['acc_smime_username'])],
			'privkey'   => $acc_smime['pkey'],
			'passphrase'=> $_passphrase
		);
		return $this->smime->decrypt($_message, $params);
	}
}