Arvel Hathcock wrote:
I propose that the side advocating removal of the NXDOMAIN check agree
to language which makes this step AT LEAST a SHOULD and preferably a MUST.
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 (ADSP).
2. Modifies SMTP. (Yes, really.)
Having non-normative text that describes it serves to promote the idea but not
couple it with the fate of ADSP.
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