Creating a CNAME record for each of the domain addresses or subdomains you've got in the hosting account will allow you to point it to a different domain/subdomain. The forwarded Internet domain will lose all its records - A, MX etc, and will take the records of the domain name it is being pointed to. In this light, you simply can't create a CNAME record to forward your domain to a third-party company and retain a functional email service with the first hosting provider. It is also essential to know that a CNAME record is always a string of words and never a number because it is regularly confused with the A record of the domain name being forwarded. One of the main uses of a CNAME record is to forward 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. By doing this, the site will appear under your own domain address, not under some subdomain provided by the third-party provider.