I use Virtualmin with Postfix and this annoying error message kept popping up:
Your Postfix configuration is missing the system's mail hostname
It was easy to fix and get rid of this error message. All I had to do was edit the Postfix configuration file located at /etc/postfix/main.cf
I edited the main.cf file and made sure that my hostname was added to "mydestination" line.
If you do this fix, you may need to restart postfix to see any effect.
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