Not to leave out some of the other obvious choices:

    basilix - A PHP (both PHP3 and PHP4) and IMAP based webmail application
    imp - Web Based IMAP Mail Program.
    twig - The Web Information Gateway
    squirrelmail - Webmail for nuts
    sqwebmail - Webmail Server

For more description and detail about these packages on debian systems:
"apt-cache show <package>" or open a browser to
http://packages.debian.org/<package>.  You should be able to find info
about these on http://freshmeat.net and
http://google.com/search?q=webmail+GPL.

-- 
Chad Walstrom <chewie at wookimus.net>                 | a.k.a. ^chewie
http://www.wookimus.net/                            | s.k.a. gunnarr
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