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- AMaViS - A Mail Virus Scanner
- A script that interfaces a mail transport agent (MTA) with virus scanners. Latest stable release is 0.3.12, 2003-03-06.
- Add-ons Mirror - the "New" Extensions Site
- Extensions and themes for Firefox, Thunderbird, SeaMonkey, Flock, Nvu, and much more. Formerly called The Extensions Mirror @www.extensionsmirror.nl.
- Althea - GUI IMAP email client for X
- Last updated in 2002.
- Balsa - The GNOME Email Client
- An email client for the GNOME desktop.
- BasiliX - Your Mail Gateway
- A webmail application based on PHP and IMAP, and powered with the MySQL database server. Site available in English and Turkish.
- Bill's Linux Qmail Toaster
- This HOWTO provides instructions on how to build a Qmail "toaster" and should work for the popular Linux distributions. (2006) Also available in Italian.
- Bogofilter
- A mail filter that classifies mail as spam or ham (non-spam) by a statistical analysis of the message's header and content (body).
- Bongo Project
- Easy-to-use mail and calendaring software. The goal of this project is to make sharing, organisation, and communication simpler, quicker, and more useful.
- Claws Email - the Email Client that Bites!
- A user-friendly, lightweight email client based on GTK+. Latest version is 3.4.0, 2008-04-18. Formerly known as Sylpheed-Claws.
- Cone: COnsole Newsreader And Emailer
- A text-based mail client; a GPLed replacement for Pine
- Courier Mail Server
- An IMAP and POP server; also a MTA server, a webmail application and a web administration interface. Latest version is 0.53.3, 2006-08-28.
- Dovecot
- An open source IMAP and POP3 server for Linux/UNIX-like systems.
- EFF - Electronic Frontier Foundation Article - "Noncommercial Email Lists; Collateral Damage in the Fight Against Spam"
- Outlines the problems with current spam filtering techniques and the basic principles and best practices for both email listowners and ISPs. (2004) This article is still relevant today (2008).
- Ecartis - Modular Mailing List Manager
- Formerly Listar - Modular Mailing List Management.
- Enhancing E-Mail Security With Procmail; the E-mail Sanitizer
- A tool for preventing security attacks via email messages; latest version is 1.191 2006-09-09.
- Exmh
- X user interface to MH mail. Latest release is 2.7.2, 2004-01-07.
- Extension Room - Firefox, Mozilla and Thunderbird Extensions
- One of the best sites for accessing XUL-based extensions for Firefox, Mozilla, and Thunderbird; organized by broad subject category, each extension has a short description, install information and user comments.
- Fetchmail Home Page
- A full-featured and robust remote mail retrieval and forwarding utility. Latest release is 6.3.8, 2007-04-06.
- FreePOPs
- An extensible program that downloads mail from webmail portals through the POP3 protocol. It can also be used as an RSS/Atom aggregator. Also available in French, Italian, and Spanish. Latest release is 0.2.5, 2007-06-22.
- GNUMail.app
- A fast mail application for GNUstep and Mac OS X.
- Hashcash
- A denial-of-service counter measure tool; primarily a spam management tool using a hascash stamp, but also can be used for protecting wikis from defacement.
- IMAP on Linux: A Practical Guide
- 1998 Linux Gazette article; contains useful information.
- IlohaMail
- A full-featured, multi-lingual webmail program.
- JAWmail
- A webmail client with support for MIME mail, address book, plugin system, different themes and many languages. Runs on PHP, MySQL and connects to IMAP servers. Latest stable release is 2.0.1, 2002-12-31.
- KMail: Kontact Mail
- The email component of Kontact, the KDE PIM (Personal Information Management) suite.
- KShowMail - the Human Spam Filter
- A POP3 mail checker for the KDE with these features: show number, size and more information about the mail messages on POP3 servers in a list view; show the mail headers or complete mail message, delete unwanted mail from the server by configurable filters. Latest stable release is 3.2.9.1, 2007-08-05.
- Life with Qmail
- A comprehensive guide to qmail. (2006)
- Logicalware:mailmanager
- A cross-platform, multi-user system which organizes and centrally stores mail on a Zope database; can be run with many email clients.
- MIMEDefang - The MIMEDefang Community Web Site
- A framework for filtering e-mail. Latest release is 2.58, 2006-11-07.
- MTA Comparison
- This survey looks at Mail Transfer Agents (MTAs) for Linux. (2007)
- MUMail - Java applet: read your mail from your home page
- A Java applet designed to let the user read their mail from their home page. Latest release is 1.4.2, 2004-09-21.
- Mahogany Mail
- Cross-platform mail and news client.
- Mail 2 Forum (M2F)
- Add-on software to the phpBB forum system which combines the functionality of a mailing list system and a phpBB forum in order to add bi-directional communication.
- Mail2sms - convert a mail to short text
- Converts a single (large) mail to a tiny text with contents from the mail.
- MailScanner
- Anti-virus and anti-spam filter. Latest release is 4.56, 2006-10-01.
- Mailfilter Homepage
- Anti-spam utility.
- Mailgraph Homepage
- A simple mail statistics RRDtool frontend for Postfix that produces daily, weekly, monthly and yearly graphs of received/sent and bounced/rejected mail.
- Mailman, the GNU Mailing List Manager
- Software for managing electronic mail discussion and e-newsletter lists.
- Majordomo
- A program which automates the management of Internet mailing lists.
- Majordomo Frequently Asked Questions (FAQ)
- A comprehensive document about majordomo. Latest version is 1.244, 2001-10-20.
- Melon
- A simple utility that notifies the user for newly received emails, through a couple of configurable icons. An xbiff replacement. Latest release is 1.2, 2002-08-31.
- MultiMail Blue Wave/QWK Reader
- An offline mail packet reader for Unix and other systems.
- Muttprint
- An application for printing out email using LaTeX.
- NeoMail
- A web-based email client with multi-language support.
- Novell Evolution 2
- An email client plus task lists, calendaring, and contact management functions.
- Nuclear Elephant: DSPAM
- An anti-spam engine designed for system-wide filtering and third party integration; uses Bayesian statistical analysis to improve spam filtering success rates.
- Online X-Face Converter
- Image converter for use in email or Usenet news headers.
- Open WebMail
- Open WebMail is designed to manage large mail folder files in a memory-efficient way. It also provides a range of features to help users migrate smoothly from Microsoft Outlook to Open WebMail. Originally based on Neomail version 1.14 from Ernie Miller. Latest release is 2.52, 2006-05-02.
- PGPEnvelope
- An interface between Pine (email client) and the GNU Privacy Guard (GnuPG). Latest stable release is 2.10.2, 2001-05-11.
- PHPlist
- A mailing list and newsletter manager.
- POPFile Home Page
- Automatic mail classification tool. Available in English, Norwegian, German, Portuguese (Brazilian), French, Spanish and Danish.
- Paul Graham Home Page - Anti-Spam
- Numerous articles on spam by Paul Graham, plus links to spam resources and the annual Spam Conference.
- Pine Information Center
- Pine (a Program for Internet News & Email) is one of the original email clients; developed by University of Washington. A great command-line email client with outstanding documentation.
- Postfix Wiki
- A wealth of online resources about Postfix can be found here including the source code and excellent documentation.
- Procmail Quick Start: An introduction to mail filtering with a focus on procmail by Nancy McGough
- A comprehensive tutorial on Procmail; latest revision: May, 2005.
- Pyzor
- Python-based spam detector and blocker.
- Qmail
- This is the official website maintained by the Qmail developer.
- Qmail-Scanner - A Content Scanner for Qmail
- Email content scanner that enables a Qmail email server to scan all email it receives for certain characteristics (normally viruses), and take action. Latest release: 2.00, 2006-04-03.
- QmailAdmin
- A web interface for managing a qmail system with virtual domains.
- Qmailrocks
- A comprehensive Qmail installation resource.
- Ricochet - Automated Agent For Tracing And Reporting Internet Junk Mail
- Latest stable release is 0.98, June 2003.
- SYMPA - mailing list manager
- An open source mailing list software, which is highly customizable, easy to administer, and translated into 15 languages; latest stable release is 5.2, 2006-04-11.
- Sendmail Home
- A mail transfer agent (MTA) that is a well-known project of the open source, free software and Linux/UNIX communities. Distributed both as free software and proprietary software.
- Sendmail Home
- A mail transfer agent (MTA) that is a well-known project of the open source, free software and Linux/UNIX communities. Distributed both as free software and proprietary software.
- SpamAssassin
- One of the more well-known, open source spam filtering programs for Linux and other operating systems. Latest stable release is 3.2.3, 2007-08-08.
- SpamAssassin Wiki
- An information and wiki for SpamAssasin, an open source spam filtering programs for Linux and other operating systems.
- SpamBayes: Bayesian Anti-Spam Classifier Written in Python.
- A cross-platform, anti-spam classifier written in Python. Latest stable release is 1.1a4, 2007-06-25.
- Spammimic - Hide a Message in Spam
- Encrypt email to look like spam.
- Spicebird | Open Source Collaboration
- A cross-platform, integrated email, calendaring, IM, and RSS client derived from Mozilla Thunderbird.
- SquirrelMail - Webmail for Nuts!
- A standards-based webmail package written in PHP. It includes built-in pure PHP support for the IMAP and SMTP protocols, and all pages render in pure HTML 4.0 (with no JavaScript required) for maximum compatibility across browsers. Available in many languages.
- Sylpheed
- A lightweight and user-friendly e-mail client; available in English and Japanese. Latest stable version is 2.3.1, 2007-01-16.
- The IMAP Connection
- A resource site for IMAP (Internet Message Access Protocol).
- The MIMEDefang HOWTO
- A comprehensive guide to installing a Linux (or BSD derivative, or UNIX) system-based mail server with sendmail, MIMEDefang, spam filtering software, and anti-virus software. (2006)
- The Mutt E-Mail Client
- A small and powerful text-based mail client.
- The Postfix Home Page
- Modern and secure mail server software; a replacement for Sendmail. Check the documentation section -- it is excellent.
- The SeaMonkey Project
- An all-in-one Internet apppliance suite which includes a Web browser, advanced e-mail and newsgroup client, IRC chat client, and HTML editing. It has excellent localization support. Latest release is 1.1.9, 2008-03-12. The successor to the Mozilla Application Suite.
- The SpamBouncer: a Procmail-Based Spam Filter
- A spam filter that runs under Procmail, a Unix-based email processing program. Latest release is 2.2, 2006-04-16.
- The eMailman(sm) Homepage -- Unix/Linux mail clients
- An annotated list (with links) of Linux email clients; organized by broad subject category.
- The exim Internet Mailer Homepage
- Mail transfer agent (MTA).
- The msmtp homepage
- A SMTP client that can be used as a SMTP plugin for Mutt and other MUAs (mail user agents).
- The nmh - New Message Handler
- An email handling system that consists of a collection of simple, single-purpose programs to send, receive, save, retrieve, and manipulate email messages. Latest stable release is 1.2, 2005-12-20. Latest development release is 1.3, 2008-04-27.
- The qmail Homepage
- A modern SMTP server; a comprehensive information site with lots of referring links.
- Thunderbird Mail Project Page
- The Mozilla Thunderbird Mail Project is a a cross-platform standalone email client; a redesign of the original Mozilla email client.
- Unix SysAdm Resources: Email/Sendmail
- Lots of information about email, sendmail, spam blockers; includes links to further information.
- VMailMgr
- Virtual MAIL ManaGeR is a package of programs designed to manage multiple domains of mail addresses and mailboxes on a single host; works with qmail for email delivery and control.
- Vipul's Razor
- A distributed, collaborative, spam detection and filtering network.
- Welcome to Dada Mail - Mailing List Manager
- A Web-based email list management system, which runs on any hosting account that can execute custom CGI scripts.Latest stable release is 2.10.15, 2007-06-26.
- Welcome to SpamProbe - A Fast Bayesian Spam Filter
- A fast, intelligent, automatic spam detector using Paul Graham-style Bayesian analysis of word counts in spam and non-spam emails. Latest stable release is 1.4b, 2006-02-18.
- XMail Home Page
- An Internet and intranet mail server with features such as an SMTP server, POP3 server, finger server, multiple domains, spam protection, and SMTP authentication.
- YPOPs! - Free POP3/SMTP Access to Yahoo! Mail
- A cross-platform application that provides POP3 access to Yahoo! Mail.
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