Fix: Postfix Plesk SMTPD 'connect from unknown 127.0.0.1' fatal error

Posted on April 27, 2013

I've found that every time I update my Plesk 11 server, I can no longer send or receive email. I was able to find the following messages in my maillogs.

postfix/smtpd[1672]: connect from unknown[127.0.0.1]
postfix/smtpd[1672]: fatal: host/service localhost/12768 not found: Name or service not known

The solution is actually very simple. Open your Postfix/Main.cf file

nano /etc/postfix/main.cf

Now search for the word “milter” and comment those lines out.

#smtpd_milters = inet:localhost:12768
#non_smtpd_milters = inet:localhost:12768

Restart postfix

service postfix restart

Enjoy!

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