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@@ -129,8 +129,9 @@ class syncMail {
             'Undelivered Mail Returned',
             'Mail delivery failed:',
             'Delivery Status Notification',
-            'Undeliverable:',
-            'failure notice',
+            'Undeliverable',
+            'failure',
+            'Undelivered',
         ];
 
         foreach ($keys as $key){