It appears that Scott Kitterman <[email protected]> said: >>> What definition are you wondering why we didn't stick to? >> >>Real non-existence. I'm not sure how to define it formally, ...
The DNS has had a formal definition of non-existence for over 30 years. You look up a name, if it returns records or NOERROR it exists, if it returns NXDOMAIN it doesn't. There is no reason for us to invent something new and incompatible. >I don't remember exactly why we settled on A/ AAAA/ MX, but the lack of a >clear, actionable definition is why we included one. See above. I don't remember where the text in A.4 came from, but it is wrong. If we are telling people to test whether a domain exists, they should do it the way the DNS does it. The correct test happens to be cheaper than A.4, one query rather than three. R's, John _______________________________________________ dmarc mailing list [email protected] https://www.ietf.org/mailman/listinfo/dmarc
