Appendix A5 in the I-D describes "Issues with ADSP in Operation". This
appendix existed in RFC 7489 (March 2015), when ADSP was already set to
Historic (November 2013).
Bullet #2 in that appendix says "Nonexistent subdomains are explicitly out of
scope in ADSP." DNARC, instead has an apposite np= policy.
However, in Authentication-Results one can write dkim-adsp=nxdomain. I found
no equivalent result for dmarc=. Shouldn't there be one?
Best
Ale
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