I currently have several people using my web/email server for mail relaying (The server is setup as a virtual hosting box).
They all seem to be relaying fine besides one user. Below is one of the error return emails in full from this user:
From: The Post Office [mailto:email@example.com]
Sent: 04 April 2006 22:04
The original message was received at Tue, 4 Apr 2006 22:03:32 +0100 from
----- The following addresses had permanent fatal errors -----
----- Transcript of session follows -----
while talking to userone.co.uk.:
>>> MAIL From:"The Post Office" <firstname.lastname@example.org>
<<< 501 "The Post Office" <email@example.com>... Refused
There was also another email error which reported that "domain1.com loops back to myself". Yet domain1.com is a domain somewhere else in the world which has nothing to do with the relay server - It was just someone the user was E-mailing.
My first thought is that there's a virus, but i'm hoping someone with a bit more Postfix knowledge might know otherwise.