signiture file

[Matt Dunford]

Dear Mutt Users:

Is there a way to specify a program for a signiture file?  I've tried
various ways without success and I've also browsed the site, the faq, and
the news archives.

I have a perl program which spits out a random saying. How do I make this
my signiture file?

I was thinking along the lines of something like:
set signature="! perl rand_saying.pl"