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message transfer agent

   Also found in: Acronyms, Wikipedia 0.04 sec.

message transfer agent

The store and forward capability in a messaging system. See messaging system.

(messaging)Message Transfer Agent - (MTA, Mail Transfer Agent) Any program responsible for delivering e-mail messages. Upon receiving a message from a Mail User Agent or another MTA, often by SMTP over the Internet, it stores it temporarily locally and analyses the recipients and delivers it to any local addressees and/or forwards it to other remote MTAs (routing) for delivery to remote recipients. In either case it may edit and/or add to the message headers.

The most widely used MTA for Unix is sendmail, which communicates using SMTP.

RFC 2821 (SMTP) expands MTA as "Mail Transfer Agent" though this is less common. Alternatives with "Transport" are also seen but less correct.


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The Sendmail vulnerability may permit an attacker to completely take over Sendmail message transfer agent (MTA) servers, left unprotected or protected by weaker firewalls, on the Internet or on corporate and government networks; subsequently, e-mail privacy and availability are compromised.
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