This is called a "Parked domain". In order to have domain.com point to yourdomain.com, you will have to login at your cPanel and click on the Parked domains icon. There you should add domain.com as parked. Once you are done, you should set the DNS servers of domain.com to match the one that yourdomain.com uses. This can be done in our accounts area if the domain is purchased through is or at your registrar's control panel if the domain was purchased elsewhere. If you need to upgrade your account to allow this please contact us.