I am attempting to setup a Postfix server as a second mail server in my domain. It works fine for any mail that is generated within the subnet that the server is on. My issue is that Postfix is bouncing back mail sent to the server from outside the subnet.

Here is an example of the issue:

Reporting-MTA: dns; linux1.beausanders.com
X-Postfix-Queue-ID: 36C50E853EA
X-Postfix-Sender: rfc822; Beau.Sanders@gvltec.edu
Arrival-Date: Fri, 26 Oct 2007 09:29:28 -0400 (EDT)

Final-Recipient: rfc822; linux1.beausanders.com@linux1.beausanders.com
Original-Recipient: rfc822; beau2@linux1.beausanders.com
Action: failed
Status: 5.0.0
Diagnostic-Code: X-Postfix; unknown user: "linux1.beausanders.com"


Notice that the Final-Recipent is different than the Original-Receipent. I do not know what is causing this behavior. I imagine this is a small confiuration mistake, but I am having trouble finding my error.

Any help is greatly appreciated.

beau@beausanders.com

After about two hours of trying to remember how Postfix works, I got to the bottom of the issue. I am using postmap to do virtual mapping. All I had to do was add the new users to the virtual mapping file and recompile the database and it worked. Virtual mapping is great, you just got to remember to use it.

For more on postmap, take a look at the man pages.

-Beau