I am trying to limit the SMTP traffic from the WAN to my mail server to only receive mail from my spam pre-filtering source. I have set up the access rules in the firewall section, but cannot figure out how to direct the traffic to the specific IP on the inside of the network other than through port forwarding. The problem is that port forwarding does not limit the SMTP traffic according to the access rules. It appears that the port forwarding supercedes the access list. How can I set it up so that SMTP traffic from the clean source gets directed to the correct LAN IP? Thanks for any help you can provide
