mail bouncing
 

dear all

am using atmailserver which i have configured it as relay server for another domain, the problem arose sometimie when they are sending mails, the mails bouncing with the below error;my server is smtp.mm.com

----- The following addresses had permanent fatal errors -----
< Muu@zac.com>

----- Transcript of session follows -----
.. while talking to smtp.mm.com
>>> DATA
<<< 550-Virus Phishing.Heuristics.Email.SpoofedDomain detected. Mail delivery
550 avoided.

What's your question?

Your server is rejecting the mail due to being spam/virus, as the message says.