[ietf-dkim] Are lookalike domains like parent domains?

[Tony Finch]

On Thu, 1 May 2008, Arvel Hathcock wrote:

> > ADSP's current NXDOMAIN language is a particularly bad example of a
> > specification that disagrees with the SMTP spec, and it also seems
> > to be based on a misunderstanding of how the DNS works.
>
> What is the misunderstanding?

There are two kinds of "not found" responses in the DNS: NXDOMAIN and
NODATA. The current draft only treats one of them as an error, which is
very unusual for applications. It's also a common mistake for someone to
say NXDOMAIN when they mean NODATA. If the spec is deliberately being
clever about DNS semantics then it should have a couple of sentences to
explain this.

Tony.
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