Mail delivery agent

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A Mail Delivery Agent (MDA) is software that accepts incoming e-mail messages and distributes them to recipients' individual mailboxes (if the destination account is on the local machine), or forwards to another SMTP server (if the destination is on a remote server).

A mail delivery agent is not necessarily a mail transfer agent (MTA), although on many systems the two functions are implemented by the same program.

On Unix systems, procmail is the most popular MDA. LMTP is a protocol that is frequently implemented by network-aware MDAs.

See also: mail user agent (MUA).

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