Open Source Desktop Operating Systems Mail Transfer Agents

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

YPOPs! is an application which emulates a POP3/SMTP mail server and provides free POP3 and SMTP access to Yahoo! Mail. It does not depend on Yahoo's POP3/SMTP mail server. You can use a mail client of your choice!

RxImap Mail Transfer Utility functions to transfer the mails from one Imap Exchange Server account to another, through a windows based application. User will be able select the Imap folders which he needs to transfer to another account.

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 Proxy server.

Email2Fax and Fax2Email gateway for Asterisk, that could be integrated to your own existing Asterisk.

This is a milter which scans emails with CRM114

IMAP protocol implementation in C++

F1-Mailer : A simple Mailer in command line for windows users with MIME format. F1-Meiler allows people sending emails via SMTP relaying servers on the Web, with mail attachement. File attachment and email dating support. A tool to begin in Web/SMTP.

Go Gmailer is a java based desktop app to send emails.It is developed for people having slow internet connection.It is real simple and quick to send emails from this app. N.B.: It is recommended to create an app password for this app and choose remember me option to login after entering the app password so that you don't have to remember the app password for your G-mail account separately.This is JAVA based app so no doubt of security! If you have any issues with app then feel free to email us at- help.gomailer@gmail.com Like us at Facebook - www.facebook.com/gmailers

Your own mailing system (most easiest to use with zero configuration) for the entire world (available in almost all the languages of the world) which will include Mail User Agent and Mail Transfer Agent thus trying to give maximum speed while transferrin

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.

This is a milter which scans emails with qsf (Quick Spam Filter)

Qmail NMX is a project that intends to bring commercial features to Qmail, enabling it to manage high volume environments. Features such as scalability, high availability, high volume users, etc... are available to Qmail with this project.

A small, fast, secure, anti-spam SMTP mail server (MTA). Delivery to mbox files and Maildirs supported. qwik-smtpd supports RBL, relay checking, raw/custom message handlers, and more. Custom authentication via checkpassword and a qmail-compatible configu

TLim (Transaction Limiter) TLim is a patch that spam-hardens sendmail against both inbound and outbound abuse. TLim counts the number of transactions an IP performs. Should the IP violate admin-defined limits, it is sanctioned via a null route.

A collection of Webmin Modules written by Dr. Angelo 'Archie' Amoruso. Please refer to the Project Web Page (http://webmod.homelinux.org) in order to download files. Thanks.

milter interface for Kaspersky antivirus daemon

dkfd is a DomainKeys filter daemon using libdomainkeys library. targeted usage is SMTP proxy of Postfix MTA. Currently developing under Linux/FreeBSD, and Solaris.

VSOUP - Multi-threaded message transfer agent for email and news.