Hello,

I am new to Linux. I am running RH Linux 7.3 which needs to be our email (Sendmail) server. IPTABLES is already installed. Could someone help with setting it up for email.

Thanks & Regards,
Srinivasan.

you could use lokkit to configure the ip tables for you

its in /usr/sbin/lokkit on RH9 and you need to be root to run it

put firewall on "High" but go to "customize"

In customize you can set up the ports, and only the ports, you need open. For example, to set up port 25 (SMTP) you can:

run lokkit

Check off "High"

Go to Customize

In "Other Ports": type 25:tcp (Assuming SMTP port 25)

Click OK

Click OK again

Note: to enter mulitple ports, separate each by a space. For example:

25:tcp 110:tcp

would open port 25 (SMTP) and port 110 (POP3)

Actually lokkit does not work in RH 7.3
For some reason, it is setup for ipchains and not for iptables - iptables is used with Kernel 2.4.x.

So, you can try the following GUI tools
FireStarter
http://firestarter.sourceforge.net/
Shorewall
http://www.shorewall.net/

Or if you want to set it up manually,
take a look at the documentation and tutorials on Netfilter
http://www.netfilter.org/

FireGate - Customizable script
http://firegate.sourceforge.net/

Good catch Mathieu.