For some reason, I just must be missing something. I start with pages one and two of the Debian Sarge how-to, THEN I skip into the Virtual users and domains with postfix.... (etc) http://www.howtoforge.com/virtual_postfix_mysql_quota_courier I get the database infor setup in MySQL. I get quota set up (I even hit page 3 of the Debian Sarge how-to to work that) Get DNS set up (hit page 3 of Debian Sarge how-to to work that) and I get to the point of getting users in the database and postfix logs saying mail is queued and delivered, but the mail bounces back. I get: <[email protected] I've confirmed that 'mail.example.com' resolves on the server and it correctly identifies the external IP address of this server as that mail server. Perhaps I should have delved deeper into the Sarge How-to first? But if I did that, doesn't the Virtual Users and Domains how-to duplicate a large amount of that effort? I'm just not seeing it somehow.