[Mimedefang] Domain canonifyin g and RFCs
Ernst du Plooy
eduplooy at gmail.com
Thu Oct 20 05:41:58 EDT 2011
Steffen Kaise wrote:
> Sorry, I mixed up with the original situation; bind barks if the MX points
> to a CNAME, but the original question was a CNAME pointing to MX/A records.
Yes, I believe it is governed by RFC 2181 section 10.3
10.3. MX and NS records
The domain name used as the value of a NS resource record, or part of
the value of a MX resource record must not be an alias. Not only is
the specification clear on this point, but using an alias in either
of these positions neither works as well as might be hoped, nor well
fulfills the ambition that may have led to this approach. This
domain name must have as its value one or more address records.
Currently those will be A records, however in the future other record
types giving addressing information may be acceptable. It can also
have other RRs, but never a CNAME RR.
More information about the MIMEDefang