Setting up a CNAME record for any one of the domains or subdomains you have within a hosting account will enable you to point it to a different domain/subdomain. The forwarded Internet domain will lose all its records - A, MX and so on, and will take the records of the Internet domain it is being pointed to. In this light, you cannot create a CNAME record to forward your domain name to a third-party company and maintain a working email service with the first hosting company. It is also essential to know that a CNAME record is always a string of words rather than a number because it is often mistaken for the A record of the domain name being redirected. One of the major uses of a CNAME record is to point a domain name you own through one provider to the servers of some other provider in case you have created a website with the latter. That way, the site will appear under your own domain address, not under some subdomain provided by the third-party provider.