Free gnubiff software for linux

gnubiff project is a mail notification program that checks for mail and displays headers when new mail has arrived.
Main features:
- Multiple mailbox support
- pop3, apop, imap4, mh, qmail and mailfile support
- SSL & certificates support
- GNOME support with complete integration to panel
- GTK stand-alone support
- Automatic detection of mailbox format
- Mail header & content display
- IDLE state support for imap4
- FAM support for mh/qmail/mailfile
- PNG animation support
- Highly configurable
- Spam filtering
- HIG 2.0 compliance
- Small memory usage
Installation:
To install gnubiff with GNOME:
./configure --prefix=`pkg-config libpanelapplet-2.0 --variable=prefix`
make
make install
To install gnubiff with GTK only:
./configure --disable-gnome
make
make install
Enhancements:
- Showing/Hiding popup via SIGUSR signals
- Options for showing/hiding popup/applet in the taskbar
- Several small bugfixes