1. Postfix is a mail transfer agent (MTA) that routes and delivers electronic mail.

  2. Exim is a message transfer agent (MTA) developed at the University of Cambridge for use on Unix systems connected to the Internet.

  3. Sendmail is a general purpose internetwork email routing facility that supports many kinds of...

  4. OpenSMTPD is a FREE implementation of the server-side SMTP protocol as defined by RFC 5321, with...

  5. The Courier mail transfer agent (MTA) is an integrated mail/groupware server based on open...

  6. sSMTP is a simple MTA to deliver mail from a computer to a mail server.

  7. Configure SMTP e-mail in IIS when you want to deliver e-mail messages from your site.

  8. A small Mail Transport Agent (MTA), designed for home and office use. Part of ...

  9. PowerMTA is an industrial-strength software for high-volume email delivery.

  10. msmtp is an SMTP client.

  11. qmail is the name of an advanced level of mail transfer agent for the UNIX based operating systems.

  12. MailerQ is a high performance Mail Transfer Agent (MTA) designed for delivering large volume email messages at very high speeds.