MacBiff is a GPL'd Mac OS X "Biff" Program. Check IMAP email automatically.
MacBiff is a GPL'd Mac OS X "Biff" Program. It periodically checks your IMAP server for new email, and reports where in your folder hierarchy your new mail resides.
MacBiff works on Mac OS X 10.3 and greater. It has been tested, and seems to work fine on Tiger.
http://macbiff.sourceforge.net/