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SMTP
From iA wiki
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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