SMTP is short for Simple Mail Transfer Protocol, a protocol for sending e-mail messages across the Internet.
Most e-mail systems that send mail across the Internet use SMTP to send messages from one server to another. The email messages can then be received by using either POP3 or IMAP.
The greatest strengths of SMTP are it's reliability and simplicity. Messages either get delivered to a recipient, or there is an error message returned that explains why the delivery wasn't possible.
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