[Exim] Procmail

Ok. The idea of a .forward with | /usr/bin/procmail was a bust. It prevented
any delivery of mail.

No errors in the log file, everything looks fine, but it would not appear in
my box till I removed the .forward then my box was flodded with all the
email ssince I installed the .forward.

So, I ask again. How do I configure exim to process a message with procmail
before delivering it to the user so that the rules in .procmailrc will be
obayed?
I'm sure it's a director config or somethign like that (perhaps a
transport?), but I'm not sure how.

Thanks!