Stop GroupShield from sending clean mail

McAfee’s GroupShield for Exchange 2000 sends the usless remains of an infected email with a stupid attachment called Replaced Infected File.txt. Our users have been getting a lot of these and I would like to tell GroupShield not to send these usless things on to the recipient. I know there must be a reason it does it but I have not see any reason in the past 3 years that I have been using GroupShield.