[exim] Spamassassin Question

Hello Everyone.

Currently We are using Spamassassin with sendmail (spamd, milter).
I have searched and found out that I can't use spamd for a single domain or perhaps a few domains. The server I use the filter doens't have the users assigned on it. It acts as a filter in front of the real servers. I also have Kaspersky Virus Check on the same server.
My question is: Is it possible to check certain domains for spam on exim???


Thanx.
Serhan Türkmenler