introduction
(taken from http://www.pcwebopedia.com/TERM/S/SMTP.html)
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.
SMTP is a plain text protocol so you can type it into a terminal yourself. Writing plain text protocols has been very popular since the 1980's, but you could say the same about U2. This makes e-mail basically insecure. You must add some encryption system if you want to send "bla bla bla atomic bomb" messages that you don't want the CIA to be able to read.
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