554 5.7.1 Relay access denied


I'm facing one issue with one of my e-mail domain unable to receive external e-mail. Can anyone please help me?

I have been running Ubuntu server 8.04 with licensed Virtualmin for several months now.

I have 4 domains running and recently one of the domain is unable to receive external e-mail.

The rest of the domain is running fine.

It happened 2 days ago out of a sudden.

This is what I have in the mail.log,

Nov 5 09:16:25 ns1 postfix/smtpd[32436]: NOQUEUE: reject: RCPT from blu0-omc2-s35.blu0.hotmail.com[]: 554 5.7.1 username@mydomain.com: Relay access denied; from=agatohuang@hotmail.com to=username@mydomain.com proto=ESMTP helo=<blu0-omc2-s35.blu0.hotmail.com>


Agato Huang



Try going to Limits and Validation -> Validate Virtual Servers, and validating just that domain. Let us know if it reports any errors, particularly in the mail configuration ..