Mail delivery agent

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A Mail Delivery Agent (MDA) is software that delivers e-mail messages right after they've been accepted on a server, distributing them to recipients' individual mailboxes.[1]

[edit] Implementation

A mail delivery agent is not necessarily combined with a mail transfer agent (MTA), although on many systems the two functions are implemented by the same program or package. Various MTAs let the postmaster or the user configure which MDA will handle relevant incoming messages.

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

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