Postfix is a free and open-source mail transfer agent that routes and delivers electronic mail, when you get an error like this:
unknown: "fatal: file /etc/postfix/main.cf: parameter mail_owner: user postfix has same user ID as _postfix
it typically means you need to fix some configuration inside of /etc/postfix/main.cf. If you do not plan on ever using postfix, then you do not need to worry about it, perhaps maybe even remove postfix altogether from your server, otherwise you will not be able to start your SMTP if you do plan to use it.
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