hMail Server
hMailServer is a free e-mail server for Microsoft Windows. Its used by Internet service providers, companies, governments, schools and enthusiasts in all parts of the world.
Archiveopteryx stores email in a database and provides access to it through IMAP and more.
archiveopteryx is an internet mail server, optimised to support longterm archival storage. it seeks to make it practical not only to manage large archives, but to use the information therein on a daily basis instead of relegating it to offline storage.
archiveopteryx runs on linux, freebsd, netbsd, openbsd and mac os x. the source code is written in core c++, using very few libraries, and compiles without any warnings.
archiveopteryx's unique advantages include:
scalability searching and categorisation interoperability and standards compliance stable, longterm archival storage security easy administration
imap pop3 mail-server postgresql sasl
hMailServer is a free e-mail server for Microsoft Windows. Its used by Internet service providers, companies, governments, schools and enthusiasts in all parts of the world.
Free Open Source Windows
The Cyrus IMAP server differs from other IMAP server implementations in that it is generally intended to be run on sealed servers, where normal users cannot log in.
Free Open Source Mac OS X Linux
The Courier IMAP server is a fast, scalable, enterprise IMAP server that uses Maildirs. Many E-mail service providers use the Courier IMAP server to easy handle hundreds...
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The Mercury Mail Transport System is a mail server that sends and receives messages on behalf of a group of users on a machine or local area network.
Free Personal Windows