Trying to setup Postfix on RH 8.0 and use it as an e-mail bastion host. I am having trouble with port 25. When I installed RH 8.0, I specified the firewall settings to keep ports open for SSH and SMTP. No matter what I try, an nmap scan to this computer from another computer on the network says port 25 is filtered and I can't telnet to port 25. From the RH 8.0 computer, I can telnet (telnet localhost 25 works). I have disabled sendmail and setup Postfix. I have customized lokkit to keep port 25 open. I have told it no firewall at all. I have given the command "service iptables stop". I have unchecked iptables in the list of services in the graphical service manager. A "service iptables status" reports "accept" for outbound, inbound and forwarding - basically wide open. No matter what I do, an external Nmap scan still says it's filtered and I can't telnet to it from the outside. By the way, if I scan ports 20-30, all are reported as filtered except for SSH, which is "open".
Are there some other firewall settings or am I doing something wrong? Help! - I'm really stumped!