Creating a CNAME record for any one of the domains or subdomains that you've got in the hosting account will enable you to point it to a different domain/subdomain. The forwarded domain will lose all its records - A, MX etc, and will take the records of the domain address it's being forwarded to. In this light, you cannot create 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 essential to know that a CNAME record is always a string of words rather than a number because it is frequently wrongly identified as the A record of the domain address being forwarded. One of the primary uses of a CNAME record is to direct a domain address you own through one provider to the servers of another provider assuming you have created 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 company.