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That portability helped make the Simple Mail Transfer Protocol (SMTP) increasingly influential.For a time in the late 1980s and early 1990s, it seemed likely that either a proprietary commercial system or the X.400 email system, part of the Government Open Systems Interconnection Profile (GOSIP), would predominate.Neither the users nor their computers are required to be online simultaneously; they need to connect only briefly, typically to a mail server or a webmail interface, for as long as it takes to send or receive messages.Originally an ASCII text-only communications medium, Internet email was extended by Multipurpose Internet Mail Extensions (MIME) to carry text in other character sets and multimedia content attachments.Today's email systems are based on a store-and-forward model.Email servers accept, forward, deliver, and store messages.The separator is then followed by the field value (the "body" of the field).
Some early email systems required the author and the recipient to both be online at the same time, in common with instant messaging.
Electronic mail has been most commonly called email or e-mail since around 1993, Computer-based mail and messaging became possible with the advent of time-sharing computers in the early 1960s, and informal methods of using shared files to pass messages were soon expanded into the first mail systems.
Most developers of early mainframes and minicomputers developed similar, but generally incompatible, mail applications.
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