xlbiff

X Literate Biff. Displays From and Subject lines of your new mail

Xlbiff lurks in the background, monitoring your mailbox file (normally /var/spool/mail/<yourusername>). When something shows up there, it invokes the MH scan(1) command and displays the output in a window. If more mail comes in, it scans again and resizes accordingly. Clicking the left mouse button anywhere in the window causes it to vanish. It will also vanish if you inc(1) and the mailbox becomes empty. Xlbiff is modeled after xconsole -- its job is to sit invisibly and pop up only when something demands your attention.