Hi, In my case whenever I faced this kind of issue. The main culprit was the Antiviruse that we have installed on the server. The antiviruse has property which block the mass mailing mechanism to stop even if the SMTP and other things are configure right!! Let me know your view.Manish Patil
http://patilmanishrao.wordpress.com
Posting is provided "AS IS" with no warranties, and confers no rights.