Creating a CNAME record for any of the domain addresses or subdomains you've got within 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 it's being pointed to. In this light, you can't create a CNAME record to direct your domain name to a third-party company and keep a functional email service with the first provider. Also, it is important to note that a CNAME record is always a string of words rather than a number as it is commonly confused with the A record of the domain name being forwarded. One of the primary uses of a CNAME record is to forward a domain which you own through one provider to the servers of some other company assuming you have created an Internet site with the latter. By doing this, the website will appear under your own domain name, not under some subdomain provided by the third-party company.