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E-MailRelay is a simple SMTP proxy and relay MTA, written in C++, for Linux and Windows. As a proxy all messages can be passed through a user-defined program, such as a spam-filter, which can drop, readdress, or edit messages as they pass through.
The Courier mail transfer agent (MTA) is an integrated mail/groupware server based on open commodity protocols such as ESMTP, IMAP, POP3, LDAP, SSL, and HTTP. Courier provides ESMTP, IMAP, POP3, Webmail, calendaring, and mailing list services.
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
jumfi will provide a java based uniform mail filter interface using C, JNI and Java. It will allow mail filters build in java to be applied to multiple mail servers of similar and different design.
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Python API for Sendmail Milters. Related modules provide features such as content filtering, SPF, and reputation tracking. Changes are posted first to https://github.com/sdgathman/pymilter and related repos.
Spey is the easy way to reduce the amount of spam you receive. It sits between your mail server and the outside world and performs greylisting and other verification checks. It needs very little configuration and no mail server setup and Just Works(TM).
Tools for a mail delivery service, including LMTP and POP3 servers and also getpwnam() emulation. Mail is stored in Maildir++ format (qmail plus courier extensions as soft quota and subfolders). User defined filter and virtual domains are supported.
TMDA is an open source anti-spam system and local mail delivery agent written in 100% pure Python. TMDA combines whitelists, blacklists, a challenge/response system, and special-purpose e-mail addresses called "tagged addresses" to thwart spam.
The OpenPEC project is a collaborative effort to develop an Open Source Certified E-Mail System (in italian: Posta Elettronica Certificata or PEC) as requided by the Italian law. See the DigitPA (CNIPA) site for details (http://www.cnipa.gov.it)
The ploinMailFactory is a mailing framework that provides extended features like a templating mechanism, multitenancy and localizaion. Internally it uses the commons-email API from Apache.
...Scores RBLs, RHSBLs, HELO, Client IP and MAIL FROM argument and sums up a score on which you can reject the mail before DATA will be received. Results are cached. I.e: a weighted SMTP filter before DATA (queue).
MailArchiva is a powerful, full featured email archiving (email archiver) and compliance solution for mail systems such as Microsoft Exchange. It stores all incoming, outgoing and internal emails for long term storage. A web based user interface is avail
A BASH function library of neat stuff for dealing with electronic mail. The library provides support for unencrypted and TLS encrypted relaying of email with attachments, special mailing list filtering and From address spoofing.
dkim-connector is a daemon that facilitates the configuration of dkim-milter (especially for multi domain hosting; with postfix and sendmail) and is accessible via webservices (for a simplified adaption of specific admin tools) and a console client
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.
Pop3/Smtp connector for email server. Using scheduler / multithread download email from POP3 account or act as an SMTP gateway. Filtering via external tools.
This project aims to implement in-line filtering functionality for Sendmail. This will allow filters to process mail data on the wire (i.e. earlier). This is primarily intended for better status reports of in-transit mails.
Server to read, process and send eMails used to apply business-rules on eMail traffic. Starting with rewriting mime headers up to do complex calculations is every possible using the build-in plug-in technology.