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A high-speed covert tunnel that disguises TCP traffic as SMTP email
SMTP Tunnel Proxy is a high-speed covert tunneling proxy that disguises regular TCP traffic as legitimate SMTP email communication to evade deep packet inspection (DPI) firewalls and censorship systems. It implements a SOCKS5 proxy interface on the client that wraps outbound traffic into an SMTP-like handshake (EHLO, STARTTLS, AUTH) and encrypted payload, making the session appear to DPI systems as a normal email exchange.
Anti-Spam SMTPProxy Server implements multiple spam filters
The Anti-Spam SMTPProxy (ASSP) Server project aims to create an open source platform-independent SMTPProxy server which implements auto-whitelists, self learning Hidden-Markov-Model and/or Bayesian, Greylisting, DNSBL, DNSWL, URIBL, SPF, SRS, Backscatter, Virus scanning, attachment blocking, Senderbase and multiple other filter methods. Click 'Files' to download the professional version 2.8.1 build 24261.
The “Tisiphone” project is an Open Source business intelligence appliance. This appliance will technically represent an SMTPproxy server sitting between the Organization email server and the usual Spam/Antivirus appliances.
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A proxysmtp 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
SORBS - Spam and Open Relay Blocking System - NOT http://www.sorbs.net/ This project is to provide a SMTPproxy that automatically checks incoming SMTP connections for origination from a server with an unsecured SMTP server and/or Proxy server.