NOCC - Host your own Webmail Client

NOCC is a webmail client written in PHP. It provides webmail access to IMAP and POP3 accounts.

Features

Connection to IMAP and POP3 server with c-client library
Sending mail with Sendmail or SMTP server
Support MIME attachment messages (it passes the "MIME Torture Test" that UW makes available)
Multi-language support (36 languages so far)
Themable (you can change all the colors and fonts easily)
Renders pages in XHTML 1.0 for maximum compatibility with any browser, works with text browsers
No frames, cookies not required (can use URL-based sessions)
No need of a database
Works on Win32, various Unix systems (including suEXEC with Apache)
Distributed under GPL license