Postfix error: connect to HOST[/var/run/cyrus/socket/lmtp]: Permission denied

It may be when you try to send test emails, they doesn’t arrive. So the first thing we do is to see the logs. File /var/log/mail.log should give us a clue and when trying to send a message we can see clearly this “permission denied message”.

It means postfix doesn’t belong to mail group, so, let’s make it:

$ sudo gpasswd -a postfix mail

Then restart postfix, and you should start receiving messages.

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