MJM said on Fri, Aug 08, 2003 at 02:32:45PM -0400:
Recent threads have piqued my interest and desire to use separate
MUA/MTA/MDA.
MUA: The thing the user users to compose mail. Mutt, webmail, pine, Outlook.
These often use SMTP to submit their outgoing mail, but that doesn't make them
MTA's, 'cause they don't do routing.
MTA: Mail Transport Agent. The thing that routes email. sendmail, postfix,
exim. Speaks SMTP in both directions (in and out), and may speak LMTP for
delivery. May also accept mail on the submission port.