Minimum PostFix configuration for sending emails only?

sendmail postfix email-server

The postfix documentation tells you exactly what you need to do.


I suggest you instead use msmtp as just an outgoing email server. Simpler than configuring postfix, and there's no chance you will ever accidentally configure it to recieve mail (because it can't).

Here's a howto for configuring msmtp as your system mailer.

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