
Postfix
Exim
OpenSMTPD
Sendmail
sSMTP
Mail-in-a-box
Dragonfly Mail Agent
The Courier mail transfer agent (MTA) is an integrated mail/groupware server based on open...

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When comparing Courier-MTA and Diffee, you can also consider the following products.

Postfix is a mail transfer agent (MTA) that routes and delivers electronic mail.
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Exim is a message transfer agent (MTA) developed at the University of Cambridge for use on Unix systems connected to the Internet.
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OpenSMTPD is a FREE implementation of the server-side SMTP protocol as defined by RFC 5321, with...
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Sendmail is a general purpose internetwork email routing facility that supports many kinds of...
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sSMTP is a simple MTA to deliver mail from a computer to a mail server.
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Mail-in-a-Box provides webmail and an IMAP/SMTP server for use with mobile devices and desktop mail software and also includes contacts and calendar synchronization.
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