Cant telnet to port 25 - Redhat/Postfix

Hi everyone.

I just did a fresh install of RedHat 9, running Postfix. I am able to send mail from the server to local accounts...no problem. I can ssh remotely on 22, telnet remotely on 23, and ping the server. I can also telnet from the server itself to 127.0.0.1 on port 25, but cannot telnet to 25 remotely or even from other computers on the internal network. Of course, I cannot send or receive smtp mail either. I've confirmed that the SMTP port is open through the firewall GUI (still kind of a newbie with command line interface).

Also, I'm on a dynamic IP using dyndns.org to resolve the domain. Thought that might be the problem, but then not being able to telnet from the intranet using an inside IP shot that down.

Any ideas? Thanks in advance.

What happens when you telnet? connection refused, Login not valid, etc...????

Give us a clue to help diagnose what is going on to deny you telnet.

Also, Did you install Firewall at the HIGH level when you installed RH9?, that automatically closes most\all ports.