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X.400 is a suite of ITU-T recommendations that define the ITU-T Message Handling System (MHS).. At one time, the designers of X.400 were expecting it to be the predominant form of email, but this role has been taken by the SMTP-based Internet e-mail. [1]
Within the Internet email system, a message transfer agent (MTA), [1] mail transfer agent, [2] or mail relay is software that transfers electronic mail messages from one computer to another using the Simple Mail Transfer Protocol. [3] In some contexts, the alternative names mail server, mail exchanger, or MX host are used to describe an MTA.
An e-mail agent is a program that is part of the e-mail infrastructure, from composition by sender, to transfer across the network, to viewing by recipient. The best-known are message user agents (MUAs, aka, e-mail clients) and message transfer agents (MTAs, programs that transfer e-mail between clients), but finer divisions exist.
The client in this case would typically be an Internet-facing mail gateway. LMTP is not intended for use over wide area networks. In other words, the message transfer agent (MTA) still handles all outgoing mail, including the mail stream from the LMTP, to another mail server located somewhere on the Internet.
A message submission agent (MSA), or mail submission agent, is a computer program or software agent that receives electronic mail messages from a mail user agent (MUA) and cooperates with a mail transfer agent (MTA) for delivery of the mail. It uses ESMTP, a variant of the Simple Mail Transfer Protocol (SMTP), as specified in RFC 6409. [1]
Exim is a mail transfer agent (MTA) used on Unix-like operating systems. Exim is a free software distributed under the terms of the GNU General Public License, and it aims to be a general and flexible mailer with extensive facilities for checking incoming e-mail.
SRS is a form of variable envelope return path (VERP) inasmuch as it encodes the original envelope sender in the local part of the rewritten address. [2] Consider example.com forwarding a message originally destined to bob@example.com to his new address <bob@example.net>:
The most widely known example is the Internet, which is Federated around the Internet Protocol (IP) stack of protocols. Another, more visible, example is Email , where the common use of the Simple Mail Transfer Protocol (SMTP), allows alice@gmail.com to communicate with bob@example.edu and eve@hotmail.com although the software implementing each ...