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This is the Teak project ("teak")
This project is hosted by SourceForge.net. The project team describes it as:
Teak is an GUI IMAP (could also do POP3 and NNTP with some work) mail client written in php-gtk (gtk.php.net). It's still in the early stages of development but already can read/send mail via an IMAP server and local SMTP host.
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