Postfix amavisd-new question

[tuxwatcher]

I seem to have Postfix and amavisd-new up and runnig along with vexira antivirus. But with all the windows worms running around, I have alot of mail with spoofed invalid addresses on them. These are floating around as deferred and are getting reprocessed several times. I am getting notified everytime the virus is detected. How can I have these emails dropped out of the system without it being deferred?