Creating a CNAME record for any of the domain names or subdomains you have in 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 forth, and will take the records of the domain name it's being forwarded to. In this light, you can't create a CNAME record to redirect your domain name to a third-party company and retain a working email service with the first hosting company. Also, it is very important to know that a CNAME record is always a string of words rather than a number because it is often confused with the A record of the domain address being redirected. One of the major uses of a CNAME record is to forward a domain address which you own through one company to the servers of some other company assuming you have created a website with the latter. That way, the Internet site will appear under your own domain, not under some subdomain provided by the third-party company.