I've just set up a new Debian/Ubuntu server, and had a problem with Postfix rejecting mail. Mails were getting returned to sender with the error:
Diagnostic-Code: X-Postfix; unknown user: "admin"
From the command line, I opened the Postfix config file:
vi /etc/postfix/main.cf
Then I found the line:
mydestination = example.com, localhost, localhost.localdomain
(where example.com was the server address) and changed it to:
mydestination = localhost, localhost.localdomain
I saved the file (:wq) and restarted Postfix:
service postfix retstart
Emails started arriving! I believe that the original format confuses Postfix- instead of trying to find and deliver to the local mailboxes, it tries to forward them on to example.com perhaps?
Techy tidbits from a veteran of a ten-year war against CentOS and a twenty-eight-year war against Apple. Oh, and in a long entente cordiale with WordPress.
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