Networking Protocols Question:

pronounced as separate letters) 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.