my understanding of CNAME records is that an MX may not be a CNAME record, but I thought something likeThink of a CNAME like a symlink. If you have a CNAME it's the ONLY record that can exist, it points lookups at the data for the target.
What if a domain's website is hosted on a dynamic IP, and the mail is hosted on a different server than the website is? -- Octavio.