diff --git a/interface/web/mail/form/mail_user_filter.tform.php b/interface/web/mail/form/mail_user_filter.tform.php
index 0b10799163044b55e569509d6bab764d606c294a..1e5980af2d57419bc90b997c55512bd7e9bab2bb 100644
--- a/interface/web/mail/form/mail_user_filter.tform.php
+++ b/interface/web/mail/form/mail_user_filter.tform.php
@@ -121,7 +121,7 @@ $form["tabs"]['filter'] = array (
 			'datatype' => 'VARCHAR',
 			'formtype' => 'TEXT',
 			'validators' => array (  0 => array ( 'type' => 'REGEX',
-					'regex' => '/^[\p{Latin}0-9\.\-\_\ \&]{0,100}$/u',
+					'regex' => '/^[\p{Latin}0-9\.\-\_\ \&\/]{0,100}$/u',
 					'errmsg'=> 'target_error_regex'),
 			),
 			'default' => '',
diff --git a/interface/web/mailuser/form/mail_user_filter.tform.php b/interface/web/mailuser/form/mail_user_filter.tform.php
index 0f454fa6f751d3439188ac3053eb7f6858f4f720..ec693fff36c3b819dbcf8273b53efb99b80804e3 100644
--- a/interface/web/mailuser/form/mail_user_filter.tform.php
+++ b/interface/web/mailuser/form/mail_user_filter.tform.php
@@ -122,7 +122,7 @@ $form["tabs"]['filter'] = array (
 			'datatype' => 'VARCHAR',
 			'formtype' => 'TEXT',
 			'validators' => array (  0 => array ( 'type' => 'REGEX',
-					'regex' => '/^[\p{Latin}0-9\.\-\_\ \&]{0,100}$/u',
+					'regex' => '/^[\p{Latin}0-9\.\-\_\ \&\/]{0,100}$/u',
 					'errmsg'=> 'target_error_regex'),
 			),
 			'default' => '',