What is SMTP?
Short for Simple Mail Transfer Protocol, a
protocol for sending e-mail messages between servers. Most e-mail systems
that send mail over the Internet use SMTP to send messages from one server
to another; the messages can then be retrieved with an e-mail client using
either POP or IMAP. In addition, SMTP is generally used to send messages
from a mail client to a mail server. This is why you need to specify both
the POP or IMAP server and the SMTP server when you configure your e-mail
application.
Web Reference
September 6, 2005
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