Setting up a CNAME record for any one of the domains or subdomains that you've got within a hosting account will enable you to redirect it to a different domain/subdomain. The forwarded Internet domain will lose all of its records - A, MX and so on, and will take the records of the domain name it is being pointed to. In this light, you simply can't create a CNAME record to forward your domain to a third-party company and maintain a functional e-mail service with the first provider. It is also essential to know that a CNAME record is always a string of words and never a number because it is generally wrongly identified as the A record of the domain name being forwarded. One of the primary uses of a CNAME record is to point a domain address you own through one company to the servers of some other company assuming you have set up an Internet site with the latter. This way, the Internet site will appear under your own domain name, not under some subdomain provided by the third-party provider.