Penguin
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Acronym for Mail User Agent.

IE: Your mail client, such as Mutt, PINE, Elm, Gnus or MozillaMail.

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? :) POP3/IMAP confuse this, since a MDA delivers to POP3/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?