Mail Systems

• Internet Mail Consortium

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• Email FAQs

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• Sendmail Home Page
• The qmail Home Page
• The Postfix Home Page

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• Technoids.org

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• Procmail Home Page
• Procmail Documentation Project

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• Mailman, the GNU Mailing List Manager

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• Clam AntiVirus: A GPL anti-virus toolkit for UNIX
• SpamAssassin: A Mail Filter To Identify Spam
• ASSP: Anti-Spam SMTP Proxy
• Blacklists Compared

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• MailScanner

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• Dovecot: An open source IMAP and POP3 server

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• DBMail: Fast and Scalable SQL Based Mail Services

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• Email Standards Project

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• Pine Information Center
• The Mutt E-Mail Client
• The IMAP Connection

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• Mozilla Thunderbird
• OpenPGP extension to Mozilla Thunderbird
• Claws Mail: An Email Client based on GTK+

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• iRedMail - Free, Open Source Email Server Solution
• DBMail: fast and scalable sql based mail services
• DBMailAdmin - Web-based admin panel for DBMail

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• RoundCube: Webmail Project
• Zimbra Collaboration Suite
• AtMail Open: PHP Webmail Client
• Citadel: A complete and feature-rich open source groupware platform.
• The Horde Project
• Open Webmail Project
• SquirrelMail: Webmail for Nuts

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• OpenChange: Open Source implementation of Microsoft Exchange Server and Exchange protocols.

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• exmh
• nmh Message Handling System