.htaccess redirect questions

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http://forums.cpanel.net – I need to know how to do this and all my attempts have failed and I have searched the web and the forums and can not find a solution. I am finding out that users are using server A Records like example host.server.com which is pulling all my content of my main site example domain.com. I need to prevent this from happening. mx.server.com - mail server ns1.server.com - name server ns2.server.com - name server So if goes to say mx.server.com they can go to my forums say at mx.server.com/forums This is very annoying and I want to prevent the outside world from using those above (HowTos)