I know this may be a dead horse, but... "The result of an MX lookup MUST NOT be a CNAME."
Can this *please* be slightly reworded? "The RR value of an MX lookup..." perhaps?
One could argue if I do an MX lookup for "host.example.com" and get host.example.com. IN CNAME otherhost.example.com.That the result of an lookup was a CNAME, which is *not* what we're talking about being verboten.
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