diff --git a/interface/web/mail/form/mail_user_filter.tform.php b/interface/web/mail/form/mail_user_filter.tform.php
index e001f684261db14b8073b791ad543438deef0976..d5f6a0ab5bd719bf0de027a2f86f297c68c04759 100644
--- a/interface/web/mail/form/mail_user_filter.tform.php
+++ b/interface/web/mail/form/mail_user_filter.tform.php
@@ -112,7 +112,7 @@ $form["tabs"]['filter'] = array (
 			'datatype' => 'VARCHAR',
 			'formtype' => 'TEXT',
 			'validators' => array (  0 => array ( 'type' => 'REGEX',
-					'regex' => '/^[\p{Latin}0-9\.\-\_\ ]{0,100}$/u',
+					'regex' => '/^[\p{Latin}0-9\.\-\_\ \&]{0,100}$/u',
 					'errmsg'=> 'target_error_regex'),
 			),
 			'default' => '',