diff --git a/egw-pear/Net/IMAP.php b/egw-pear/Net/IMAP.php
index 1a2900ad98..3313ab0157 100644
--- a/egw-pear/Net/IMAP.php
+++ b/egw-pear/Net/IMAP.php
@@ -579,7 +579,7 @@ class Net_IMAP extends Net_IMAPProtocol {
     function _parseStructureMultipartArray($_structure, &$_mimeParts, $_partID, $_parentIsMessage = false) 
     {
         #print "Net_IMAP::_parseStructureMultipartArray _partID: $_partID<br>";
-        // a multipart/mixed, multipart/report or multipart/alternative get's no own partid, if the parent is message/rfc822
+        // a multipart/mixed, multipart/report or multipart/alternative or multipart/related get's no own partid, if the parent is message/rfc822
         if($_parentIsMessage == true && is_array($_structure[0])) {
           foreach($_structure as $structurePart) {
             if(!is_array($structurePart)) {
@@ -587,7 +587,7 @@ class Net_IMAP extends Net_IMAPProtocol {
               break;
             }
           }
-          if($subType == 'mixed' || $subType == 'report' || $subType == 'alternative') {
+          if($subType == 'mixed' || $subType == 'report' || $subType == 'alternative' || $subType == 'related') {
             $_partID = substr($_partID, 0, strrpos($_partID, '.'));
           }
         }