Signaling new mail

[the/eXtreme]

What is recommended way of visually signalling the arrival of new mail?
With Solaris mailtool I got used to a little `mailbox with letters' icon.
Mutt is so *totally cool*, though, that I don't want to go back to the
Sun mail application.

Yeah, I could just leave a mutt window open and check it periodically,
but an icon-type indication would be handy, too.

TIA---jtw