[Exim] Spammer Rejection

This is a multi-part message in MIME format.
--
[ Picked text/plain from multipart/alternative ]
I've just joined this list so please excuse the ignorance of the thicky-new-boy.

I'm using version 2.04 (yes, I know - but it works and I dont want upset anything!) on Mandrake Linux.

I am trying to set up a list of spammers so that the server rejects mails from specified domains that have been identified as junk emailers. I have not been able to make sense of the documentation on exim.org cos I'm dead thick. Which file(s) should I be editing?? Can anyone give me an example?

Many thanks

Patrick

--