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SMTP is a protocol that provides reliable and effective email transmission. SMTP is a mail service built on the FTP file transfer service. It is mainly used for the transfer of mail information between systems and provides notifications about incoming mail. SMTP is independent of a specific transmission subsystem and only requires reliable and orderly data flow channel support. One of the important characteristics of SMTP is that it can transmit mail across the network, that is, "SMTP mail relay". Using SMTP, you can achieve mail transmission between the same network processing process, and you can also use a relay or gateway to achieve mail transmission between a processing process and other networks. SMTP is a relatively simple text-based protocol. One or more recipients of a message are specified on it, and then the message text is transmitted. In the early 1980s, SMTP began to be widely used. At the time, it was just a supplement to UUCP, which was more suitable fo...
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