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The fake smtp email server for development and testing
smtp4dev - the fake SMTP email server for development and testing. A dummy SMTP server for Windows, Linux, Mac OS-X (and maybe elsewhere where .NET Core is available). Lets you test your application without spamming your real customers.
Highly scalable/configurable Messaging Platform allowing users in a domain to be distributed on multiple hosts, has multiple queues. Provides virtual domains/users in MySQL. Modern MSP class qmail replacement with ESMTP, POP3/IMAP, QMTP, QMQP support
Ciphermail email encryption gateway (S/MIME, OpenPGP, PDF encryption)
is a standards based centrally managed email server (MTA) that encrypts and decrypts your incoming and outgoing email at the gateway level. Ciphermail Email Encryption Gateway is compatible with any existing email infrastructure like Microsoft Exchange and Lotus Notes and has support for S/MIME, OpenPGP and PDF encryption.
Ciphermail Email Encryption Gateway has a built-in CA which can be used to issue X.509 certificates for internal and external users.
For additional security, keys...
Reimplementation of mailfilter (http://mailfilter.sourceforge.net/) in Python. It filters email directly on a POP3 mail server before it is downloaded by another program. This program is aimed to run on all platforms the Python programing language suppor
XM Administrator is a GUI administration tool for the XMail Email Server developed by Davide Libenzi (www.xmailserver.org). It is written in C++ using the QT3.4 framework so it is compilable to run on Linux, Macintosh, and WIN32 platforms.
PyWebMail is a Python library and POP3 gateway that enable working with WebMail servers like with POP3 or IMAP mail server. Currently Mail.Com, Yahoo! Mail, Gmail, Netscape.Net, HotMail and some minor servers support is finished.
OMLNg is a small newsletter sending program.
It provides non technical people the ability to send rich messages to groups and works with common office software/files.
It is aimed at people that do not have access to such service on a mail server.
SIMON is a very simple MTA and POP3 implementation. It is completely designed from the ground up and is useful for departmental or small to medium sized companies.
SPAMSNAIL is a anti-spam filter dedicated to end-users with a slow / non permanent connection to their mail server. It is written in Perl and uses the Bayes system.
SPAM-Buster is a Java application for filtering SPAM based on statistical algorithms (currently Bayesian). The platform independant application can be used as graphical end-user client and additional service for mail server.