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As a result, it is difficult to find the first citation for the use of the term with the more specific meaning it has today.
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.
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.
However, once the final restrictions on carrying commercial traffic over the Internet ended in 1995, Many MTAs used to accept messages for any recipient on the Internet and do their best to deliver them. This was very important in the early days of the Internet when network connections were unreliable.
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.
The header is structured into fields such as From, To, CC, Subject, Date, and other information about the email.
In the process of transporting email messages between systems, SMTP communicates delivery parameters and information using message header fields.
Email servers accept, forward, deliver, and store messages.
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.