Hi,
I put the code in the second line of 50-user and restarted amavisav. That did not start ClamAV, but I could not send or receive mail (except mail from the system to postmaster). I rebooted the machine and ClamAV was running. I killed it, and was able to send and receive email!
However, my I could hardly do anything on my system without getting Fatal Errors due to memory. So I unistalled clamav, rebooted, and clams was there again. Not sure how to get rid of it.