Does Postfix also operate as MSA?

papakota asked:

I’m just curious whether Postfix also plays a role of MSA in a process of SENDING an e-mail? In other words, does MUA “talk” directly to MTA (say, Roundcube transfers an e-mail to Postfix without any help from MDA such a Dovecot)? Again, I’m asking about sending and NOT receiving!

My answer:

Yes, Postfix can act as an MSA by enabling the submission section of and making changes to the smtp_ configuration options as desired. This is disabled by default; the tutorial you are following should instruct you to enable it as part of the setup process.

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