Take postfix for example. It's an MTA, but is it also an SMTP server? Are all MTAs SMTP servers? Are any? Is there a difference between a mail transport agent and a mail transfer agent?

Can an MTA be configured to be an SMTP server, or vice versa? What's the difference between an MTA and an SMTP server?

  • just try to read wikipedia: Within the Internet email system, a message transfer agent or mail transfer agent (MTA) or mail relay is software that transfers electronic mail messages from one computer to another using SMTP. MTA is a architectural term. SMTP is the technology used by it. – Kiwy Jul 19 '19 at 7:35

MTA is a part of SMTP server, it's responsible for receiving emails from MSA(https://en.m.wikipedia.org/wiki/Message_submission_agent) and then forwarding them to MDA (if the destination of these mails is local) or to another SMTP server. Some people call MTA a SMTP server.

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