I am having a "discussion" in a support ticket about an MX record pointing to a CNAME.
Searching for references for MX and CNAME leads to RFC 2181:
{{{
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
}}}
What is confusing here is the "Not only is the specification clear" - is
this a reference to another RFC? Because RFC 2181 seems to be a
document that is clarifying "confusing" DNS issues, and are not defining
anything ("not authoritative" in RFC terms).
RFC1035 says an MX record is a PREFERENCE + EXCHANGE, where:
EXCHANGE A <domain-name> which specifies a host willing to act as
a mail exchange for the owner name.
So, maybe "<domain-name>" is not supposed to be an alias, and RFC 2181
is re-iterating that?
--
-Justin
[email protected]
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