Creating a CNAME record for any of the domain addresses or subdomains you have within a hosting account will enable you to direct it to a different domain/subdomain. The forwarded Internet domain will lose all its records - A, MX and so forth, and will take the records of the domain it is being redirected to. In this light, you can't create a CNAME record to redirect your domain name to a third-party provider and keep a functional email service with the first provider. Additionally, it is essential to know that a CNAME record is always a string of words rather than a number as it's regularly confused with the A record of the domain being redirected. One of the main uses of a CNAME record is to point a domain address you own through one provider to the servers of some other company if you have set up a site with the latter. In this way, the site will appear under your own domain, not under some subdomain provided by the third-party provider.