Creating a CNAME record for each of the domain addresses or subdomains you have in a hosting account will enable you to redirect it to a different domain/subdomain. The forwarded domain name will lose all of its records - A, MX and so on, and will take the records of the Internet domain it is being forwarded to. In this light, you simply can't set up a CNAME record to forward your domain name to a third-party company and retain a working email service with the first provider. It's also important to note that a CNAME record is always a string of words rather than a number because it is frequently mistaken for the A record of the domain being redirected. One of the major uses of a CNAME record is to direct a domain that you own through one provider to the servers of another company assuming you have created an Internet site with the latter. By doing this, the site will appear under your own domain name, not under some subdomain provided by the third-party provider.