When the local resolver uses QNAME minimization (RFC-7816), TLD operators only get NS queries, but not A nor MX. BIND, Unbound, and PowerDNS, support QNAME minimization out of the box. Also, NXDOMAIN caching is more specific.https://twitter.com/colmmacc/status/1233654050261876736 …
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It's relatively unimportant, but current QNAME minimization implementations are likely to fail open, too. Things go wrong and they'll likely send the full query to the most-specific working nameserver they know.
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