E-mail

YPOPs.

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Developer: The YahooPOPs! Team
License: GNU General Public License (GPL)
Operating System: MacOS X, Windows 95/98/2000, Windows NT/2000, Linux, SunOS/Solaris

he Courier mail transfer agent (MTA) is an integrated mail/groupware server based on open commodity protocols, such as ESMTP, IMAP, POP3, LDAP, SSL, and HTTP.

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Developer: Courier Mail Server
License: GNU General Public License (GPL)
Operating System: Linux/Unix

KBiff new mail notification utility.

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Developer: Kurt Granroth
License: GNU General Public License (GPL)
Operating System: All

SqWebMail is the webmail module that's bundled with the Courier mail server.

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Developer: SqWebMail
License: GNU General Public License (GPL)
Operating System: Independent