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by NoviceUser (4.1k points)
In 1971 the first ARPANET email was sent,[40] and through RFC 561, RFC 680, RFC 724, and finally 1977's RFC 733, became a standardized working system.

Other, separate networks were also being created including:

    Unix mail was networked by 1978's uucp,[41] which was also used for USENET newsgroup postings
    IBM mainframe email was linked by BITNET in 1981[42]
    IBM PCs running DOS in 1984 could link with FidoNet for email and shared bulletin board posting

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