Ok, so I've been working the whole day on my Ubuntu 6.06 Firewall/Internet Gateway. Basically, all it has is two network interfaces, one which connects to my ADSL router and the other to my switch and the rest of the network. It uses simple internet connection sharing, and I'm running Squid Proxy... the firewall redirects all port 80 traffic through the proxy. So far, so good... Now the thing is, I'm running my mail server on my Windows 2003 box, so I've set up DNS to route all mail to that server... but its not working. It should be noted that I have a dynamic IP on my adsl account so I use dnsExit so solve that problem... but I thought as the mail reached my gateway bind would take over and direct it to the windows mail server. Can anyone help me out here? pweese?