CentOS: Unable to start Postfix after upgrade to version 3

centos7postfixupgrade

We are running CentOS 7, and just upgraded Postfix to version 3. Postfix won't start after the upgrade. First, there is a compatibility issue in the log, but we resolved it as suggested (postconf compatibility_level=2).

A greater problem is

postfix: /usr/libexec/postfix/post-install: Error: /etc/postfix/postfix-files is not a file

Absolutely stuck there. We tried to set chmod 777 on /etc/postfix, we tried to use postfix-install, but nothing helped.

Best Answer

Finally found the solution. /etc/postfix/postfix-files was missing, so we just used:

touch /etc/postfix/postfix-files

...and the problem solved.

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As I see from the log, you are tried to send mail from non exist domain. I assume that you are using localhost or localhost.localdomain. You should use fqdn instead

Add the following lines to the main.cf and restart postfix

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P.S. You should replace example.net with your real domain name

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yum install mysql mysql-server

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