SMTP is an abbreviation for Simple Mail Transport Protocol. It is the main protocol used to send electronic mail over the Internet. SMTP consists of a set of rules for how a program sending mail and how a program receiving mail should interact. Almost all Internet e-mail is sent and received by clients and servers using SMTP. Thus if one wanted to set up an e-mail server on the Internet, one would look for e-mail server software that supports the SMTP Protocol.
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