diff --git a/interface/web/mail/form/mail_user_filter.tform.php b/interface/web/mail/form/mail_user_filter.tform.php
index 76b54feb09037f7db2582471e95b916ac96e9db6..02dfa59b470e459f6436cc4d49a5e8de75ead280 100644
--- a/interface/web/mail/form/mail_user_filter.tform.php
+++ b/interface/web/mail/form/mail_user_filter.tform.php
@@ -88,7 +88,7 @@ $form["tabs"]['filter'] = array (
 			'datatype' => 'VARCHAR',
 			'formtype' => 'SELECT',
 			'default' => '',
-			'value'  => array('Subject' => 'subject_txt', 'From'=>'from_txt', 'To'=>'to_txt')
+			'value'  => array('Subject' => 'subject_txt', 'From'=>'from_txt', 'To'=>'to_txt', 'Detail'=>'detail_txt')
 		),
 		'op' => array (
 			'datatype' => 'VARCHAR',
diff --git a/interface/web/mail/lib/lang/de_mail_user_filter.lng b/interface/web/mail/lib/lang/de_mail_user_filter.lng
index e951d18c6bdb33a96ec2a2868075b778a7d32eaf..d789c025d758318e7983aaa19bb968423754643f 100644
--- a/interface/web/mail/lib/lang/de_mail_user_filter.lng
+++ b/interface/web/mail/lib/lang/de_mail_user_filter.lng
@@ -27,4 +27,5 @@ $wb['reject_txt'] = 'Abweisen';
 $wb['stop_txt'] = 'Stop';
 $wb['move_to_txt'] = 'Verschiebe nach';
 $wb['mark_read_txt'] = 'Als gelesen markieren';
+$wb['detail_txt'] = 'Detail-Angabe des Empfängers (user+detail@domain.com)';
 ?>
diff --git a/interface/web/mail/lib/lang/en_mail_user_filter.lng b/interface/web/mail/lib/lang/en_mail_user_filter.lng
index 6bec7601c32f7c0277a0c4b44baf90167233cad2..6f1a62ae138021047a00abd20d9f6407232ec0c4 100644
--- a/interface/web/mail/lib/lang/en_mail_user_filter.lng
+++ b/interface/web/mail/lib/lang/en_mail_user_filter.lng
@@ -27,4 +27,5 @@ $wb['reject_txt'] = 'Reject';
 $wb['stop_txt'] = 'Stop';
 $wb['move_to_txt'] = 'Move to';
 $wb['mark_read_txt'] = 'Mark as read';
+$wb['detail_txt'] = 'Detail part in recipient (user+detail@domain.com)';
 ?>
diff --git a/interface/web/mailuser/lib/lang/de_mail_user_filter.lng b/interface/web/mailuser/lib/lang/de_mail_user_filter.lng
index 1665ba14d22763412387e00b009f445090e78d4b..ac4016713bf20014df5e9e7b4b15bfb580500779 100644
--- a/interface/web/mailuser/lib/lang/de_mail_user_filter.lng
+++ b/interface/web/mailuser/lib/lang/de_mail_user_filter.lng
@@ -18,4 +18,5 @@ $wb['begins_with_txt'] = 'Startet mit';
 $wb['ends_with_txt'] = 'Endet mit';
 $wb['move_to_txt'] = 'Verschieben nach';
 $wb['delete_txt'] = 'Löschen';
+$wb['detail_txt'] = 'Detail-Angabe des Empfängers (user+detail@domain.com)';
 ?>
diff --git a/interface/web/mailuser/lib/lang/en_mail_user_filter.lng b/interface/web/mailuser/lib/lang/en_mail_user_filter.lng
index 23451b74dba6d02a5e79cd6029f6b430713e87b7..652d509741db3269dce302c97268cf66ee8d4ae5 100644
--- a/interface/web/mailuser/lib/lang/en_mail_user_filter.lng
+++ b/interface/web/mailuser/lib/lang/en_mail_user_filter.lng
@@ -18,4 +18,5 @@ $wb['begins_with_txt'] = 'Begins with';
 $wb['ends_with_txt'] = 'Ends with';
 $wb['move_to_txt'] = 'Move to';
 $wb['delete_txt'] = 'Delete';
+$wb['detail_txt'] = 'Detail part in recipient (user+detail@domain.com)';
 ?>