diff --git a/api/js/etemplate/Et2Select/Et2SelectEmail.ts b/api/js/etemplate/Et2Select/Et2SelectEmail.ts
index b11669bf03..f06e6024d0 100644
--- a/api/js/etemplate/Et2Select/Et2SelectEmail.ts
+++ b/api/js/etemplate/Et2Select/Et2SelectEmail.ts
@@ -8,9 +8,10 @@
  */
 
 import {Et2Select} from "./Et2Select";
-import {css, html, nothing} from "@lion/core";
+import {css, html, nothing, PropertyValues} from "@lion/core";
 import {IsEmail} from "../Validators/IsEmail";
 import interact from "@interactjs/interact";
+import {Validator} from "@lion/form-core";
 
 /**
  * Select email address(es)
@@ -55,6 +56,11 @@ export class Et2SelectEmail extends Et2Select
 			 */
 			allowDragAndDrop: {type: Boolean},
 
+			/**
+			 * Allow placeholders like {{email}}, beside real email-addresses
+			 */
+			allowPlaceholder: {type: Boolean},
+
 			/**
 			 * Include mailing lists: returns them with their integer list_id
 			 */
@@ -73,12 +79,25 @@ export class Et2SelectEmail extends Et2Select
 		this.search = true;
 		this.searchUrl = "EGroupware\\Api\\Etemplate\\Widget\\Taglist::ajax_email";
 		this.allowFreeEntries = true;
+		this.allowPlaceholder = false;
 		this.editModeEnabled = true;
 		this.allowDragAndDrop = false;
 		this.includeLists = false;
 		this.multiple = false;
 		this.fullEmail = false;
-		this.defaultValidators.push(new IsEmail());
+		this.defaultValidators.push(new IsEmail(this.allowPlaceholder));
+	}
+
+	/** @param {import('@lion/core').PropertyValues } changedProperties */
+	willUpdate(changedProperties : PropertyValues)
+	{
+		super.willUpdate(changedProperties);
+
+		if(changedProperties.has('allowPlaceholder'))
+		{
+			this.defaultValidators = (<Array<Validator>>this.defaultValidators).filter(v => !(v instanceof IsEmail));
+			this.defaultValidators.push(new IsEmail(this.allowPlaceholder));
+		}
 	}
 
 	connectedCallback()
diff --git a/api/js/etemplate/Validators/IsEmail.ts b/api/js/etemplate/Validators/IsEmail.ts
index 7a174c550b..df91e9d743 100644
--- a/api/js/etemplate/Validators/IsEmail.ts
+++ b/api/js/etemplate/Validators/IsEmail.ts
@@ -27,9 +27,23 @@ export class IsEmail extends Pattern
 	 */
 	static EMAIL_PREG : RegExp = /^(([^\042',<][^,<]+|\042[^\042]+\042|\'[^\']+\'|"(?:[^"\\]|\\.)*")\s?<)?[^\x00-\x20()\xe2\x80\x8b<>@,;:\042\[\]\x80-\xff]+@([a-z0-9ÄÖÜäöüß](|[a-z0-9ÄÖÜäöüß_-]*[a-z0-9ÄÖÜäöüß])\.)+[a-z]{2,}>?$/i;
 
-	constructor()
+	/**
+	 * Allow everything containing at least one placeholder e.g.:
+	 * - "{{email}}"
+	 * - "{{n_fn}} <{{email}}"
+	 * - "{{#<custom-field-name>}}"
+	 * - we do NOT check if the placeholder is implemented by addressbook or a valid custom-field name!
+	 * - "test" or "{test}}" are NOT valid
+	 */
+	static EMAIL_PLACEHOLDER_PREG = new RegExp('^(.*{{#?[a-z0-9_]+}}.*|'+IsEmail.EMAIL_PREG.source.substr(1, IsEmail.EMAIL_PREG.source.length-2)+')$', 'i');
+
+	/**
+	 *
+	 * @param _allowPlaceholders true: allow valid email-addresses OR something with placeholder(s)
+	 */
+	constructor(_allowPlaceholders: boolean)
 	{
-		super(IsEmail.EMAIL_PREG);
+		super(_allowPlaceholders ? IsEmail.EMAIL_PLACEHOLDER_PREG : IsEmail.EMAIL_PREG);
 	}
 
 	/**
diff --git a/mail/templates/default/compose.xet b/mail/templates/default/compose.xet
index 856e7e2474..7399f60021 100644
--- a/mail/templates/default/compose.xet
+++ b/mail/templates/default/compose.xet
@@ -46,7 +46,8 @@
 					</row>
 					<row class="mailComposeHeaders mailComposeJQueryReplyto">
 						<et2-description  value="Reply to"></et2-description>
-						<et2-select-email  id="replyto" width="100%" onclick="app.mail.address_click" multiple="true" searchUrl="EGroupware\Api\Etemplate\Widget\Taglist::ajax_email"></et2-select-email>
+						<et2-select-email  id="replyto" width="100%" onclick="app.mail.address_click" multiple="true"
+							searchUrl="EGroupware\Api\Etemplate\Widget\Taglist::ajax_email" allowPlaceholder="true"></et2-select-email>
 						<et2-description></et2-description>
 					</row>
 					<row class="mailComposeHeaders mailComposeJQueryFolder">
@@ -56,7 +57,9 @@
 					</row>
 					<row class="mailComposeHeaders" >
 						<et2-description  value="To"></et2-description>
-						<et2-select-email  id="to" allowDragAndDrop="true" width="100%" onclick="app.mail.address_click" multiple="true" onchange="app.mail.recipients_onchange" autofocus="true" searchUrl="EGroupware\Api\Etemplate\Widget\Taglist::ajax_email" placeholder="select or insert email address" includeLists="true"></et2-select-email>
+						<et2-select-email  id="to" allowDragAndDrop="true" width="100%" onclick="app.mail.address_click" multiple="true"
+							onchange="app.mail.recipients_onchange" autofocus="true" searchUrl="EGroupware\Api\Etemplate\Widget\Taglist::ajax_email"
+							placeholder="select or insert email address" includeLists="true" allowPlaceholder="true"></et2-select-email>
 						<et2-hbox>
 							<et2-description  id="cc_expander" value="Cc" class="et2_button_text" onclick="app.mail.compose_fieldExpander"></et2-description>
 							<et2-description  id="bcc_expander" value="Bcc" class="et2_button_text" onclick="app.mail.compose_fieldExpander"></et2-description>
@@ -64,12 +67,16 @@
 					</row>
 					<row class="mailComposeHeaders mailComposeJQueryCc">
 						<et2-description  value="Cc"></et2-description>
-						<et2-select-email  id="cc" width="100%" allowDragAndDrop="true" onclick="app.mail.address_click" multiple="true" onchange="app.mail.recipients_onchange" searchUrl="EGroupware\Api\Etemplate\Widget\Taglist::ajax_email" placeholder="select or insert email address" includeLists="true"></et2-select-email>
+						<et2-select-email  id="cc" width="100%" allowDragAndDrop="true" onclick="app.mail.address_click" multiple="true"
+							onchange="app.mail.recipients_onchange" searchUrl="EGroupware\Api\Etemplate\Widget\Taglist::ajax_email"
+							placeholder="select or insert email address" includeLists="true" allowPlaceholder="true"></et2-select-email>
 						<et2-description></et2-description>
 					</row>
 					<row  class="mailComposeHeaders mailComposeJQueryBcc">
 						<et2-description  value="Bcc"></et2-description>
-						<et2-select-email  id="bcc" width="100%" allowDragAndDrop="true" onclick="app.mail.address_click" multiple="true" onchange="app.mail.recipients_onchange" searchUrl="EGroupware\Api\Etemplate\Widget\Taglist::ajax_email" placeholder="select or insert email address" includeLists="true"></et2-select-email>
+						<et2-select-email  id="bcc" width="100%" allowDragAndDrop="true" onclick="app.mail.address_click" multiple="true"
+							onchange="app.mail.recipients_onchange" searchUrl="EGroupware\Api\Etemplate\Widget\Taglist::ajax_email"
+							placeholder="select or insert email address" includeLists="true" allowPlaceholder="true"></et2-select-email>
 						<et2-description></et2-description>
 					</row>
 					<row class="mailComposeHeaders">