Setting up a CNAME record for each of the domain addresses or subdomains you have in a hosting account will enable you to point 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 domain address it is being forwarded to. In this light, you cannot set up a CNAME record to point your domain name to a third-party provider and keep a functional e-mail service with the first hosting provider. Additionally, it is important to note that a CNAME record is always a string of words and not a number because it is commonly wrongly identified as the A record of the domain being forwarded. One of the major uses of a CNAME record is to direct a domain address you own through one provider to the servers of another provider if you have set up 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 provider.