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.
The terms mail server, mail exchanger, and MX host may also refer to a computer performing the MTA function. The Domain Name System (DNS) associates a mail server to a domain with mail exchanger (MX) resource records containing the domain name of a host providing MTA services.
A mail server is a computer that serves as an electronic post office for email. Mail exchanged across networks is passed between mail servers that run specially designed software. This software is built around agreed-upon, standardized protocols for handling mail messages and the graphics they might contain.
Read more about Message Transfer Agent: Operation, Transfer Versus Access, Issues Affecting Small Email-servers, List of MTA Software For Unix-like Operating Systems
Famous quotes containing the words message, transfer and/or agent:
“Christina Bailey: I was just thinking how much you can tell about a person from such simple things. Your car, for instance.
Mike Hammer: Now what kind of message does it send you?
Christina: You have only one real, lasting love.
Mike: Now who could that be?
Christina: You. You’re one of those self-indulgent males who thinks about nothing but his clothes, his car, himself. I’ll bet you do push-ups every morning just to keep your belly hard.”
—A.I. (Albert Isaac)
“If it had not been for storytelling, the black family would not have survived. It was the responsibility of the Uncle Remus types to transfer philosophies, attitudes, values, and advice, by way of storytelling using creatures in the woods as symbols.”
—Jackie Torrence (b. 1944)
“The childless experts on child raising also bring tears of laughter to my eyes when they say, “I love children because they’re so honest.” There is not an agent in the CIA or the KGB who knows how to conceal the theft of food, how to fake being asleep, or how to forge a parent’s signature like a child.”
—Bill Cosby (20th century)