DNS using CNAMEs breaks MX records?

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This is a common error. You cannot use a CNAME RR for your root domain (e.g. company.com) and define additional resource records for the same zone.

See Why can’t I create a CNAME record for the root record? and RFC1034 section 3.6.2 for details:

If a CNAME RR is present at a node, no
other data should be present; this
ensures that the data for a canonical
name and its aliases cannot be
different.

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