Mail Server Terms

This all might be a bit confusing to understand at first, but it’s actually quite straight forward once you get to know all of the terms. Included some more information below which will help you to remember some of the terms and their role in a mail server.

MTA – Mail Transfer Agent – Sendmail, Postfix


MDA – Mail Delivery Agent – Procmail


MUA – Mail User Agent – Outlook, Thunderbird


SMTP – Simple Mail Transfer Protocol – Sendmail, Postfix


POP3 – Post Office Protocol 3 – Dovecot


IMAP – Internet Message Access Protocol – Dovecot