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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.
The first Open-Source high-performance MTA for high-volume senders
KumoMTA is an Open-Source, enterprise-grade email message transfer agent (MTA) software for sending high-volume, business-critical emails. KumoMTA is typically chosen by high-volume email users looking to replace PowerMTA, Momentum, or traditional Open Source MTAs.
KumoMTA offers high-performance message relay to the tune of millions of messages per hour per server, combined with extreme flexibility and configurability through its use of a Lua scripting engine for configuration and...
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.
Hedwig is an open source IMAP, SMTP, POP3 server written in Java, designed with ease of installation and configuration in mind. Hedwig enables storage of mail message headers in a relational database(MySQL or Oracle) and mail messages in a file system.
Visit http://hwmail.sourceforge.net/ for more information.
Wrappers around msmtp for use as queueing MTA with extra features
This project builds on top of the (and adds additional) scripts included with msmtp (a command-line send only email client) in order for it to act as a queueing Mail Transport Agent (by acting as the sendmail command; it also offer an minimalist SMTP server mode) with some additional features like verify-before-send (which requires you to confirm that you really do want to send email, after a required delay (cooling off period)) for those who need to think twice about the wisdom of what they...
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).
GreenMail is an intuitive and easy-to-use test suite of email servers for testing purposes. Supports SMTP, POP3, IMAP with SSL socket support, and configurable user accounts and credentials. All in 100% Java.
WE'VE MOVED TO GIT HUB: https://github.com/greenmail-mail-test/greenmail
smtptrapd is a multi-threaded daemon written in C that provides a RFC 2821 compliant SMTP service that always returns a 4xx soft error to the RCPT TO verb. It can be deployed as a secondary MX to reduce the amount of inbound spam.
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.
Add-ons/modifications of sendmail m4 configuration files and helper programs/utilities.
2013-01-04: The project is frozen. It may be unfrozen after registration of users, testers, developers.
Implements a simple SMTP daemon that accepts any mail from any sender to any recipient (spam trap). All delivery attempts will be rejected but the mails can be processed anyhow. Can be extended with modules which do the processing of received mails.
tMTA - A tiny|trivial MTA tMTA (pronounced 'tomata', like 'tomato' :) is a miniature Mail Transport Agent. tMTA only supports local delivery to local users. It does not support SMTP or any form of inter-computer mail transport.
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 Postfix Extensible Policy Daemon aims to provide a flexible framework for policy delegation in the context of the Postfix MTA. It is written in Perl and accepts policy check routines in the form of Perl modules.
This is a POP3 to SMTP bridge that will use the SMTP Trace headers to determine who it's from and to. Designed to work with catch all POP3 accounts. Configuration for the POP3 and SMTP accounts are in a CSV file.