diff --git a/workflow/engine/classes/class.spool.php b/workflow/engine/classes/class.spool.php
index ce9b24f77..5df8cb1bd 100644
--- a/workflow/engine/classes/class.spool.php
+++ b/workflow/engine/classes/class.spool.php
@@ -86,8 +86,8 @@ class spoolRun
         $this->ExceptionCode['WARNING'] = 2;
         $this->ExceptionCode['NOTICE'] = 3;
 
-        $this->longMailEreg = "/(.*)(<([\w\-\.']+@[\w\-_\.]+\.\w{2,5})+>)/";
-        $this->mailEreg = "/^([\w\-_\.']+@[\w\-_\.]+\.\w{2,5}+)$/";
+        $this->longMailEreg = "/(.*)(<([\w\-\+\.']+@[\w\-_\.]+\.\w{2,5})+>)/";
+        $this->mailEreg = "/^([\w\-_\+\.']+@[\w\-_\.]+\.\w{2,5}+)$/";
     }
 
     /**