Dave,
4. The domain does not exist; the message MUST be considered
Suspicious.
Presumably "does not exist" means there is no DNS record.
(Otherwise, the
phrase "does not exist" needs to be explained.)
If references to domain names that "do not exist" means specifically
that they are not registered in the DNS -- ie, not visible on the
public Internet's view of the DNS -- then the document should say this
explicitly.
If it means something else, then that meaning needs to be made explicit.
d/
IMHO Frank is correct that this refers to NXDOMAIN. That wording seems
fairly precise. How would you improve it?
Eliot
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