SMTP stands for Simple Mail Transfer Protocol. A SMTP server that allows sending anonymous email messages. It removes or changes the “From” field of all messages that it processes.
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.
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