MX/DNS/SMTP/HELO Validator
DNS `MX` Validator `MX` Server Validator Forward/Reverse DNS Validator SMTP (ie: `HELO` or `EHLO`) Banner Validator We intend

Communications::Email::Filters
Communications::Email::Mail Transport Agents
Internet::Name Service (DNS)
Internet::WWW/HTTP::Indexing/Search
System::Networking::Monitoring

SPAMGrinderProxy
SPAMGrinderProxy is an SMTP and POP3 spam filter that runs as a service on Windows XP/2K. It works with any server or client

Communications::Email::Filters
Communications::Email::Mail Transport Agents
Communications::Email::Post-Office::POP3

OraMail - mail system based on oracle
mail system based on oracle

Communications::Email::Mailing List Servers
Communications::Email::Mail Transport Agents

Qmail-patches
Qmail-patches is a set of assembled patches available for qmail. It````````s an easy way to improve functionality of you

Communications::Email::Mail Transport Agents

SMTP Spam Proxy
Smtp Spam Blocker is a load balancing smtp proxy, that count the number of recipients and slowing the protocol at a specified

Communications::Email::Filters
Communications::Email::Mail Transport Agents

openprotect virus/spam gateway filter
OpenProtect(OSS) from Opencomputing (opencompt.com) is a Solution for Server Side E-Mail Protection(Antivirus, Antispam)

Communications::Email::Filters
Communications::Email::Mail Transport Agents
Security
System::Networking

ESUsoft.Smtp
ESUsoft.Smtp is an open source SMTP component written in C

Communications::Email::Mail Transport Agents

OpenSmtp.Net-2
OpenSmtp.net is an open source SMTP component written in C#. It does not rely on the .Net Framework System.Web.Mail classes

Communications::Email::Mail Transport Agents

Dynamic Email-Address Agent
Configuration-free SMTP agent for dynamic DNS (cable, DSL) users. NO configuration hassle just a tiny (40kb) executable.

Communications::Email::Mail Transport Agents

TarBaby
Tarbaby is a new threshold and rate limiting spam prevention tool. The intent is in creating a thresholding and verification

Communications::Email::Filters
Communications::Email::Mail Transport Agents