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FMTA is a simple SMTP/POP3 server designed to run on Fox boards (Fox board is a small but powerful embedded computer running a complete GNU/Linux system).
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SpamSnake/mHost is a open source based spam filtering appliance. Its primary goal is to provide a very flexible platform from which to implement current and future open spam filtering solutions enterprise and small networks.
Jsmtpd : A small and modular smtp email server daemon, written in Java. Jsmtpd is heavily based on plugins, and supports : spam detection (Spamassassin, Jasen, RBL servers, BlackList), anti virus (Clam Antivirus), and many others filters.
The EZ-qmail distribution is an EZ method for hobbyists / small businesses to try the qmail system for mail delivery. It provides an EZ to install, modern (patched) and working (integrated) qmail system onto which additional functionalities can be added
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.
A simple, small-scale mail delivery agent (MDA) and SMTP relay written in Perl which allows filtering and modification of both incoming and outgoing messages using arbitrary, per-user or site-wide rules. Requires "Maildir"-style mail storage.
KQ-Mail is a modular SMTP mail server using kernel queues to communicate between modules.
In it\'s basic mode it is ideal to sit between the internet and your primary mail server to provide a buffer and or a SMTP RFC enforcement engine
IDMS DBMA is an effort to develop a highly scalable (c10k complient) plugin based mail agent aimed at fighting spam & viruses. Hopefully replacing hard-to-maintain, complex, resource hungry configurations used by small to large users today.
ISOS is an e-mail and web server. It is designed for ease of use and provides a quick way to e-presence for small businesses and organizations who lack the experience to benefit from high performance, open source software such as Sendmail, Courier Mail,
A small, fast, secure, anti-spam SMTP mail server (MTA). Delivery to mbox files and Maildirs supported. qwik-smtpd supports RBL, relay checking, raw/custom message handlers, and more. Custom authentication via checkpassword and a qmail-compatible configu
LIBBY (Little Internet's Best Basic Yabber) is a simple SMTP server for home users or users of a small local network. Easy configuration and security are major features.
phpMEQPopAdmin is a small collection of PHP4-Scripts to administrate the mysql-tables for your virtual mailserver (http://www.netd.co.za/mysql-mail/). The admin of each domain can logon and create pop-mailboxes, forwarders and catchall-accounts.