in 1979, which was referenced by Jon Postel in his early work on Internet email. Postel first proposed an Internet Message Protocol in 1979 as part of the Internet Experiment Note (IEN) series.

Original SMTP

In 1980, Postel and Suzanne Sluizer published which proposed the Mail Transfer Protocol as a replacement for the use of the FTP for mail. of May 1981 removed all references to FTP and allocated port 57 for TCP

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