Setting up a CNAME record for any one of the domain names or subdomains you have in a hosting account will allow you to point it to a different domain/subdomain. The forwarded domain name will lose all of its records - A, MX and so on, and will take the records of the Internet domain it's being forwarded to. In this light, you can't set up a CNAME record to redirect your domain to a third-party company and retain a functional 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 as it is frequently confused with the A record of the domain being forwarded. One of the major uses of a CNAME record is to forward a domain name that you own through one provider to the servers of some other company when you have created an Internet site with the latter. In this way, the Internet site will appear under your own domain, not under some subdomain provided by the third-party provider.