I've got a server setup on FC5 running the latest version as of 4/28/07. It sits behind a Netgear SPI firewall router (SPI is turned off) with split DNS configured. Everything works perfectly on the local LAN and e-mails are successfully sent and received from outside servers. The only problem is that when I try to access the web interface for checking mail outside my LAN, I get no response from the server. I have port forwarding turned on for ports 80, 443, and 25 (all TCP and UDP). I seem to be able to telnet to port 80 on the server, but I can't get the web page to come up. Any suggestions?