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SMTP: acronymic for Simple Mail Transportation Protocol. This is the protocol used to send email from server to server across the internet, as opposed to the various protocols used by end-users to retrieve their mail from those servers, like POP3 and IMAP.

It is possible (and useful) to troubleshoot SMTP servers using telnet - see Daemons, testing via Telnet for a simple example.

FreeBSD can be used with many different SMTP server applications, such as sendmail or qmail. The maintainers of currently use and recommend qmail.

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