Postfix: Command rejected

[Bluedog]

Hi, I just upgraded my Plesk 11.5 on Plesk version: 12.0.18 Update #9 , and after the upgrade the Postfix stop working. And forwarding, receiving is not working at all and I am getting message bellow. Can anybody help me how to fix it?

OS: CentOS 6.5 (Final)
Plesk version: 12.0.18 Update #9


This is the mail system at host nsXXXXX.ovh.net.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

The mail system

<xyz@gmail.com>: Command rejected

Final-Recipient: rfc822; xyz@gmail.com
Action: failed
Status: 5.7.1
Diagnostic-Code: X-Postfix; Command rejected


Thanks a lot for any tips or solutions!

 

[JeremyN]

Did you find a solution? I had the same problem and found that the upgrade had activated the Plesk milter. I deactivated it in Tools & Settings --> Services Management and the problem went away.

 

[Bluedog]

My solution was to install QMail instead of Postfix and its working. I am not sure if its good solution, but the email is working now.