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Computing (FOLDOC) dictionary
Simple Mail Transfer Protocol
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messaging (SMTP) A protocol defined in STD 10, RFC
821, used to transfer electronic mail between computers,
usually over Ethernet. It is a server to server protocol,
so other protocols are used to access the messages. The SMTP
dialog usually happens in the background under the control of
the message transfer agent, e.g. sendmail but it is
possible to interact with an SMTP server using telnet to
connect to the normal SMTP port, 25. E.g.
telnet 25
You should normally start by identifying the local host:
You can then issue commands to verify an address or expand an
VRFY postmaster
or expand a mailing list:
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