CSF

I was getting the following error on a Postfix server with Virtualmin and CSF.

Apr 15 06:25:10 HOSTNAME postfix/error[3375]: BCD27BEA636: to=<email@domain.com>, relay=none, delay=4724, delays=4694/30/0/0.02, dsn=4.4.1, status=deferred (delivery temporarily suspended: connect to othermail.server.com[IP]:25: Connection timed out)

If somebody else is getting the same error, check the csf configuration. CSF has a “Firewall Security Level” and you should set the level to Low to be able to send emails.