Milter-greylist

Hi, I'm new to the list. I just installed milter-greylist to test it out
and it looks like a brilliant way to reduce the amount of rubbish
flooding our mail servers.

Here's my setup:

sendmail with 2 milters:

Milter #1: milter-greylist with an acl like this:

      # greylist if IP is listed in RBL, else whitelist
	racl greylist list "grey users" dnsrbl "FIRSTDNSBL" delay 2h
	racl greylist list "grey users" dnsrbl "OTHERDNSBL" delay 2h
	racl whitelist default

Milter #2: mimedefang (scans mail using clamav and spamassassin)


What I'm thinking of doing is this: If a mail gets past milter-greylist
and then spamassassin finds the mail has a virus, or a high spam score,
remove its autowhitelist entry in milter-greylist. Does doing this sound
reasonable and is there a way to do it? 

If it helps, I think mimedefang can be set up to use spamd rather than
the perl version of Spamassassin.

Thanks and apologies it this is a silly newbie question.

Mark