FedoraCore1 Sendmail Iptables question

[Todd]

Greetings.

I am setting up a server that will be public IP facing and would like to
ensure that the only ports accessible to the public are: ssh, http, and
smtp.

I have the following rules set for the ACCEPTS:

ACCEPT     tcp  --  anywhere             anywhere            state NEW tcp
dpt:smtp
ACCEPT     tcp  --  anywhere             anywhere            state NEW tcp
dpt:http
ACCEPT     tcp  --  anywhere             anywhere            state NEW tcp
dpt:ssh

but a nmap scan of the server shows that port 25 is closed:

22/tcp open   ssh
25/tcp closed smtp
80/tcp open   http

Any assistance would be greatly appreciated.

Thanks.

- Todd