Penguin
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Acronym for Mail Transport Agent

A program to send mail from one machine to another, usually using SMTP, but occasionaly something weird and obscure like UUCP.

sendmail(8), Postfix and Exim are MTA's. Another one that is very popular with ISPs is DJBernstein?'s qmail?, written with security in mind, and for which there has been no exploit at least since March 1997.

See also MDA (Mail Delivery Agent)