Mail Transfer Agents, including: List Of Mail Servers, Sendmail, Exim, Delivermail, Qmail, Internet Information Services, Microsoft Exchange Server, ... Postfix (software), Cyrus Imap Server, Kolab

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More info: Within Internet message handling services (MHS), a message transfer agent or mail transfer agent (MTA) or mail relay is software that transfers electronic mail messages from one computer to another using a client-server application architecture. An MTA implements both the client (sending) and server (receiving) portions of the Simple Mail Transfer Protocol.