Good summary, Tony. Here's my perspective: Tony Hansen wrote: > Tony Hansen wrote: > >> * levine-adsp-00 provides a superset of methods for *how* to >> determine if the domain exists: the NXDOMAIN test and the "check MX & >> A/AAAA" method from SMTP. It leaves it up to the implementation to >> choose the algorithm that works best for it. >>
While I agree that, in practice, either practice is "good enough", I don't see a good reason for specifying two different ways of doing this test. The closest to this that I have seen is Tony Finch's comment that there might be some resolvers that don't distinguish NXDOMAIN from (for example) a no-data result, but I haven't seen anyone cite an example of this so I don't know whether this is a hypothetical or real consideration. Since ADSP is a security-related specification (or, at least, this is a WG in the Security Area), I think it's beneficial to be as precise as possible about how the ADSP Check is done. -Jim _______________________________________________ NOTE WELL: This list operates according to http://mipassoc.org/dkim/ietf-list-rules.html