Mercury (MTS)
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Mercury Mail Transport System: Mercury is a free, standards-based mail server solution, providing comprehensive, fast server support for all major Internet e-mail protocols. It is supplied in two versions, one hosted on Windows systems, the other running as a set of NLMs on Novell NetWare file servers.
Mercury Mail Transport System, Overview
Mercury, is developed by David Harris (software developer) of New Zealand, who also develops Pegasus Mail, a [donationware] email client (was [freeware] prior to 2007-01.