So, I take this as a "no" to the compromise proposal (at least from one
person). That's too bad.
Having the ADSP specification include normative text that calls for
validating the From field domain name does two things:
1. Couples an entirely separate and more generally useful mechanism
(checking domain name validity) to one that is considerably more limited
I believe that a normative reference would require that the result of an
already widespread practice be part of an ADSP evaluation. Where the
practice is not already extant, claimed compliance with ADSP could
require it. That's all.
2. Modifies SMTP. (Yes, really.)
I don't understand, please explain. This sounds new.
Having non-normative text that describes it serves to promote the idea
but not couple it with the fate of ADSP.
Non-normative language leaves ADSP deployers in the dark about whether
the protocol can be relied on because success would depend upon an
optional NXDOMAIN check that some have, some don't, and none need
perform. Since we know the protocol needs this in order to avoid being
trivially defeated and since it has already been acknowledged as a
common practice it seems inexcusable for an engineering team to make it
an optional thing or to simply "promote the idea."
Perhaps we could get some other people to weigh in on this matter.
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