Hi All I have POSTFIX as my MAILSERVER running on CENTOS 5.4 32bit Here is my setup/config: Domain Name: tailinsubic-chatserver.com eth0: ISP IP eth1: Internal IP in my main.cf i configured based on what i want to achieved for example I want to establish External and Internal EMAIL using POSTFIX [email protected] has permission to send and recieve email outside in any domain name such as yahoo.hotmail,gmail and etc but for [email protected] permitted only local but the problem on this is can receive incoming email on other domain like yahoo,gmail,hotmail and etc, But for sending in other domain is rejected. only in same domain name Please anyone can help to block all incoming. Thanks