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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.
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
A SMTP to ESMTP proxy that accepts mail, parses it for template variables. The template variables are rendered with values from a CSV file. Next they are sent to the ESMTP server. Uses Template::Toolkit, Config::Simple alongwith other libraries.
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
A little Java-Server-Software (like a SMTP-proxy), which accepts incoming SMTP-Messages. The subject will be parsed for @ or + symbols, which should control time shifted sending. If not contained, the message will be forwarded to parent smtp.
A proxy smtp server with
1. Use of user-selectable DNSRBL lists to reject mail with customised rejection messages
2. Spam trap addresses to identify dictionary attacks and other spam sources
3. White listing and blacklisting by IP addresses and domain
SPAMGrinderProxy is an SMTP and POP3 spam filter that runs as a service on Windows XP/2K. It works with any server or client, scanning each message for SPAM and flagging those that are. It can interoperate with SpamAssassin or use its own filters.
A mailgate-server, acting as a gateway between private networks of a company and Internet. The working scheme is simple: (internal mailbox)<-->(external Internet mailboxes). Uses POP3 protocol. Its work is gonna be completely transparent to the end users.
SORBS - Spam and Open Relay Blocking System - NOT http://www.sorbs.net/ This project is to provide a SMTP proxy that automatically checks incoming SMTP connections for origination from a server with an unsecured SMTP server and/or Proxyserver.