Hello. What is the difference between mail sent from my masqueraded/NAT server to my ISP's mail server and my MUA masqueraded/NAT mail to their server ? I'm wondering as the server is now getting '550 relaying to user is not allowed' , but when I send the same mail from the mua it does go out. I was using them as a smart host as I have a dedicated connection. Regards...Martin -- --------------- Any given program costs more and takes longer each time it is run. -- The Second Law of Computer Programming