Acronym for Mail User Agent.
IE: Your mail client.
a MUA sends email via a MSA to a MTA, which passes it along to other MTA's until it reaches it's final destination, where it is passed to a MDA to deliver it to the users MUA. All very simple right? :) POP?/IMAP confuse this, since a MDA delivers to POP?/IMAP, which then end up going to the MUA sometimes via another MTA or MDA. Anyone know what the acronym for a popper/imap daemon would be?
14 pages link to MUA: