use iptables to turn off port 25

[csross]

I'm very new to linux. It was suggested that I use/run iptables to turn off port 25 on a server. Postmaster mail is overpowering my main mail server and it will not stay local (although the aliases file says portmaster root). How do I use iptables to turn off port 25? Better yet, how do I keep portmaster/root mail local?

Thanks

 

[spydyr]

Configuring iptables is a very complicated task for new users. Check out firehol. It gives you a user friendly approach to configuring iptables.

http://firehol.sourceforge.net/

In regards to your email question. In the aliases file does root have an alias? You can always change the postmaster root line to postmaster /dev/null