[HexDEF6]

# Qmail-Scanner disabled for mail from 127.0.0.1 
127.0.0.1:allow,RELAYCLIENT="",RBLSMTPD="",QMAILQUEUE="/var/qmail/bin/qmail-queue" 
# Qmail-Scanner enabled (virus only) for mail from local network 
192.168.0.:allow,RELAYCLIENT="",RBLSMTPD="",QMAILQUEUE="/var/qmail/bin/qmail-scanner-queue.pl" 
# Qmail-Scanner enabled (virus and spam) for mail from external internet 
:allow,QMAILQUEUE="/var/qmail/bin/qmail-scanner-queue.pl"

questo lo metti in /etc/tcp.smtp
poi fai:
tcprules tcp.smtp.cdb tcp.smtp.tmp < tcp.smtp

Ciao!