SMTP

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See also: E-mail | Protocol

Acronym: Simple Mail Transfer Protocol

The de facto standard for e-mail transmission across the internet. It is a relatively simple, text-based protocol, where one or more recipients of a message are specified (and in most cases verified to exist) and then the message text is transferred. It is quite easy to test a SMTP server using the telnet program.

SMTP uses TCP port 25. (From Wikipedia SMTP)

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(Adaption from Wikipedia is FDL licensed)