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- The history of email entails an evolving set of technologies and standards that culminated in the email systems in use today. Computer-based messaging between users of the same system became possible following the advent of time-sharing in the early 1960s, with a notable implementation by MIT's CTSS project in 1965. 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. Over time, a complex web of gateways and routing systems linked many of them. Some systems also supported a form of instant messaging, where sender and receiver needed to be online simultaneously. In 1971 the first ARPANET network mail was sent, introducing the now-familiar address syntax with the '@' symbol designating the user's system address. Over a series of RFCs, conventions were refined for sending mail messages over the File Transfer Protocol. Several other email networks developed in the 1970s and expanded subsequently. Proprietary electronic mail systems began to emerge in the 1970s and early 1980s. IBM developed a primitive in-house solution for office automation over the period 1970–1972, and replaced it with OFS (Office System), proving mail transfer between individuals, in 1974. This system developed into IBM Profs, which was available on request to customers before being released commercially in 1981. CompuServe began offering electronic mail designed for intraoffice memos in 1978. The development team for the Xerox Star began using electronic mail in the late 1970s. Development work on DEC's ALL-IN-1 system began in 1977 and was released in 1982. Hewlett-Packard launched HPMAIL (later HP DeskManager) in 1982, which became the world's largest selling email system. The Simple Mail Transfer Protocol (SMTP) protocol was implemented on the ARPANET in 1983. LAN email systems emerged in the mid-1980s. 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, a combination of factors made the current Internet suite of SMTP, POP3 and IMAP email protocols the standard. During the 1980s and 1990s, use of email became common in business, government, universities, and defense/military industries. Starting with the advent of webmail (the web-era form of email) and email clients in the mid-1990s, use of email began to extend to the rest of the public. By the 2000s, email had gained ubiquitous status. The popularity of smartphones since the 2010s has enabled instant access to emails. (en)
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