Setting up a CNAME record for each of the domain addresses or subdomains you have in the hosting account will allow you to point 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's being pointed to. In this light, you simply can't create a CNAME record to point your domain to a third-party company and keep a functional email service with the first hosting company. Additionally, it is important to note that a CNAME record is always a string of words rather than a number as it's commonly wrongly identified as the A record of the domain address being redirected. One of the main uses of a CNAME record is to point a domain name you own through one company to the servers of some other provider assuming you have set up an Internet 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.