High Quality Content by WIKIPEDIA articles! Within Internet message handling services, a message transfer agent or mail transfer agent or mail relay is a computer process or software agent that transfers electronic mail messages from one computer to another, in single hop application-level transactions. A MTA implements both the client and server portions of the Simple Mail Transfer Protocol. The term mail server is also loosely used to mean a computer acting as an MTA by running the appropriate software. The term mail exchanger, in the context of the Domain Name System formally refers to an IP address assigned to a device hosting a mail server, and by extension also indicates the server itself. A MTA receives mail from either another MTA, a mail submission agent, or a mail user agent. The transmission details are specified by the Simple Mail Transfer Protocol. In the case where any recipients of a given message are not hosted locally, the message is relayed, that is, forwarded to another MTA.

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