gnubiff is a mail notification program that periodically checks for
mail and displays headers when new mail has arrived. It supports
multiple mailboxes, pop3, apop, imap4, mh, qmail and mailfile, SSL and
certificates, GNOME with integration to the panel, GTK standalone,
automatic detection of mailbox format, mail header and content display,
PNG animation, HIG 2.0 compliance, and spam filtering.