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A fast, client-server design for greylisting service. Initially intended for Postfix based e-mail servers, includes country identification and other tuning parameters.
Mstone is a mail performance measurement system. It can simultaneously test SMTP, POP, IMAP, and some HTML based systems. It measures transaction latency in multiple stages, and graphs the combined results from multiple clients.
Amber - a "grey list" for Qmail. Amber sits in the tcpserver chain, not accepting or rejecting mail but deferring connections from new IP addresses for some time (default five minutes) before it starts accepting mail from them.
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Mixmaster is an anonymous remailer. Remailers provide protection against traffic analysis and allow sending electronic mail anonymously or pseudonymously.
Mixmaster consists of both client and server installations.
Standalone mail classification/delivery daemon for multi-user Unix servers. Written in C, it embeds perl in order to use SpamAssassin efficiently. It implements a process manager with persistent spam checker processes running under users' own UIDs.
The deepOfix Mail Server makes it possible for organisations with minimal technical expertise to have robust server infrastructure. It offers unprecented ease of use, doesn't require prior GNU/Linux experience and is backed by a full-time support team.
SpamAssassin for Win32 is a free and powerful anti-spam filter for Windows. Includes a resident daemon for mail servers and a user-friendly personal spam filter that works with any POP3 account and any email client.
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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
With DynaStop, an Exim administrator or procmail admin/user can filter incoming mail on the basis of whether it is a dynamic IP address, thus reducing system load and resources in processing unwanted mail.
qrcptcheck searches user databases to check if a supplied email address will be delivered to a valid recipient, with the goal to avoid mail bounces rejecting mail at SMTP level.
Reply-o-Matic is a highly configurable, secure, auto reply software, to be used in conjunction with any Mail Delivery/Transfer Agent or local delivery agent.
It provides an easy, uniformed way, to provide autoreplies to e-mails.
g-milter, or "guerilla milter", is an open source filter for restricting arriving mail not checked by existing filters due to standards compliance. Running this will catch more spam but almost certainly violates e-mail standards. Requires sendmail.
OpenVacation it's a simple mail vacation software written in PHP (in the future in C), who don't depend of others softwares (e.g. PostfixAdmin) with SQL-based administration & configuration. Easy to integrate with Postfix, Maildrop and others.
Clamdmail is a qmail-queue replacement that allows mail to be filtered, greylisted, or rejected before queuing based on connection information and/or message content by providing an interface for programs like clamd-greylist, clamdscan and SpamAssassin.
AISK is an acronym for Artificial Intelligence Spam Killer. It is a server side filter that acts as a kind of PROXY and uses SMTP to communicate with MTA. Main decision mechanism is based on artificial neural network capable of finding patterns, learning
Small SMTP wrapper designed to be used in chroot-ed environment as a sendmail command-line tool replacement. e.g. warpper can be used by php ( by function mail ) instead of using SMTP client written in php
Spammer is an anti-spam mail filter for Sendmail and Postfix. It uses libmilter to communicate with the MTA. Spammer checks client IP addresses as well as all IP addresses in the "Received: " headers against a DNSBL database.
Rupicapra is (going to bee) a console (newt) application for reading email. It is using the libetpan mail engine, so it will support IMPO, POP and may local email connections.
ClamMail is POP3 email proxy for Windows with integrated ClamAV antivirus engine.
ClamMail is an Windows antivirus that protects your PC from viruses transferred via mail. Works with Outlook,Thunderbird,Eudora and many others using popular POP3 protocol
Ghost In The Mail is a very basic mail client for Linux, written in C, for GTK. It supports attached files. The user can specify the SMTP server, the sender's e-mail, and the name.
elspy is an extension to the Exim MTA that allows Exim users to supply a local_scan() function written in Python instead of C. (Exim's local_scan() API lets sysadmins supply site-specific code for approving/rejecting email messages at SMTP time.)