SMTP (Simple Mail Transfer Protocol)
SMTP (Simple Mail Transfer Protocol) is a TCP/IP protocol
used in sending and receiving e-mail. However, since it is limited in its ability to queue
messages at the receiving end, it is usually used with one of two other protocols, POP3 or IMAP, that
let the user save messages in a server mailbox and download them periodically from the server. In
other words, users typically use a program that uses SMTP for sending e-mail and either POP3 or
IMAP for receiving e-mail. On Unix-based
systems, sendmail
is the most widely-used SMTP server for e-mail. A commercial package, Sendmail, includes a POP3
server. Microsoft Exchange
includes an SMTP server and can also be set up to include POP3 support.
SMTP usually is implemented to operate over Internet port 25. An
alternative to SMTP that is widely used in Europe is X.400. Many
mail servers
now support Extended Simple Mail Transfer Protocol (ESMTP),
which allows multimedia files to be delivered as e-mail.
Contributor(s): Joseph Mathew
This was last updated in September 2005
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