iptables port 25
after all of my tutorial searching online i have'nt found any solution in my simple problem after all the trials of iptables command.
My problem is i have a centos box w/ 2 nics one is the modem ip and the other is for the lan, this acts as my firewall wanna be,
I want to test my friends e-mail server to be functional when passing through the firewall 1st to get out to the internet for its sending purposes.
It really does send mails to yahoo and others but when it replies back to my friends mail server nothing recieves.
is there any basic iptables command for this?