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The full eagle logo, used in various versions from 1970 to 1993. The United States Postal Service (USPS), also known as the Post Office, U.S. Mail, or simply the Postal Service, is an independent agency of the executive branch of the United States federal government responsible for providing postal service in the United States, its insular areas and associated states.
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.
MTA—Mail Transfer Agent; MTA—Microsoft Technology Associate; MTBF—Mean Time Between Failures; MTU—Maximum Transmission Unit; MT—Machine Translation; MUA—Mail User Agent; MUD—Multi-User Dungeon; MU—Memory Unit; MVC—Model-View-Controller; MVP—Most Valuable Professional; MVS—Multiple Virtual Storage; MWC—Mobile World Congress
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 initiating host, the SMTP client, can be either an end-user's email client, functionally identified as a mail user agent (MUA), or a relay server's mail transfer agent (MTA), that is an SMTP server acting as an SMTP client, in the relevant session, in order to relay mail. Fully capable SMTP servers maintain queues of messages for retrying ...
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]
So in the U.K., the Royal Mail delivers the post, while in North America both the U.S. Postal Service and Canada Post deliver the mail. The term email, short for "electronic mail", first appeared in the 1970s. [4] [5] The term snail mail is a retronym to distinguish it from the quicker email. Various dates have been given for its first use.