xbuffy - 3.3.bl.3.dfsg-11 main

Xbuffy is a program that displays how many unread mails you have in
your different mailboxes. You can have different titles for the
mailboxes, and define what shall happen when a new mail arrives. It
can beep and invoke a shell command, for example.
.
If you press mouse button 1 on the title associated with a mail box,
a list of From: and Subject: lines of the mails in the mail spool file
is shown. If you press mouse button 2, an arbitrary command is
executed.
.
Xbuffy can similarly watch newsgroups via NNTP.