Creating a CNAME record for any one of the domain names or subdomains that you've got in a hosting account will permit you to forward 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 address it's being redirected to. In this light, you cannot set up a CNAME record to forward your domain to a third-party company and keep a working e-mail service with the first hosting company. It's also important to note that a CNAME record is always a string of words rather than a number because it is generally mistaken for the A record of the Internet domain being redirected. One of the major uses of a CNAME record is to point a domain that you own through one company to the servers of another company when you have created an Internet site with the latter. In this way, the site will appear under your own domain address, not under some subdomain provided by the third-party company.