Setting up a CNAME record for each of the domain addresses or subdomains that you have in a hosting account will permit you to forward it to a different domain/subdomain. The forwarded domain name will lose all its records - A, MX and so forth, and will take the records of the domain it is being forwarded to. In this light, you cannot set up a CNAME record to redirect your domain name to a third-party provider and maintain a working email service with the first provider. Additionally, it is important to note that a CNAME record is always a string of words and not a number because it is often confused with the A record of the domain name being redirected. One of the primary uses of a CNAME record is to point a domain address you own through one company to the servers of another provider if you have created a site with the latter. By doing this, the Internet site will appear under your own domain name, not under some subdomain provided by the third-party company.