“Depending on whose statistics you want to believe, Linux is not
only the fastest growing server operating system on the Internet,
it already occupies the top slot. If you are using — or
considering using — Linux as your Internet e-mail server, then you
owe it to yourself to check out CommuniGate Pro. CommuniGate Pro is
a powerful, feature-rich POP3, SMTP, and IMAP4 e-mail server with
an intuitive browser-based administration interface and some
compelling extras like list services and a Web-based e-mail client.
In the extremely unlikely event you’re not planning on using Linux
(grin), don’t worry. CommuniGate Pro is also available for FreeBSD
3.x, BSDI BSD/OS, Sun Solaris, Digital UNIX (OSF1), IRIX, HP/UX,
Windows NT, and Apple MacOS X Server.”
“The version I reviewed was CommuniGate Pro 2.9, and you can
download a trial copy from stalker.com. The trial version supports
the entire feature set, but it adds the line “*This message was
transferred with a trial version of CommuniGate(tm) Pro*” to every
incoming message. You need to purchase a license key to get rid of
the line.”
…
“CommuniGate Pro provides SMTP mail exchange, and functions as a
POP3 and IMAP4 mail server. It provides Web access to POP3 or IMAP4
e-mail (you can get to all your IMAP4 server-side folders from a
browser). CommuniGate Pro also lets you create mailing lists and
provides list management services.”