A lot of mail in seperate files

Hi

I have a lot (90+) seperate files each containing a mail message and I
want them filtered by procmail.
How do I do that?

--
 ___   _/_/_/ _/_/_/_/  _/_/                     Andreas Sikkema
   ___/    _/   _/   _/                  
sikke600(_at_)hio(_dot_)tem(_dot_)nhl(_dot_)nl
__  _/_/_/_/   _/     _/_/           Gato blanco, gato negro, lo
 _ _/    _/   _/         _/       importante es que cace ratones
___/    _/   _/    _/_/_/        http://www.tem.nhl.nl/~sikke600