Setting up a CNAME record for each of the domains or subdomains that you have in the hosting account will enable you to direct it to a different domain/subdomain. The forwarded domain will lose all its records - A, MX and so on, and will take the records of the domain address it's being forwarded to. In this light, you cannot create a CNAME record to forward your domain to a third-party company and keep a working e-mail service with the first hosting provider. Also, it is essential to know that a CNAME record is always a string of words and never a number as it's regularly confused with the A record of the domain address being redirected. One of the primary uses of a CNAME record is to point a domain address that you own through one company to the servers of some other company if you have created a 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 company.