I am using iptables to block all computers except of internal mail server from connecting to offsite SMTP servers using the following rule: /sbin/iptables -t nat -A PREROUTING -i eth0 -p tcp -s ! 192.168.1.5 --dport 25 -j DROP We now have a second mail server that needs to send out, but I can firgure out how to add two exceptions. If I add another -s I just get an error. How can I do this? -Dan
