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Cloudflare reverse DNS SERVFAIL, normal?

Once upon a time, Mark Andrews <marka at isc.org> said:
> The following is general and is not directed at Cloudflare.  I know
> some people don't think errors in the reverse DNS are not critical
> but if you are delegated a zone it is your responsablity to ensure
> your servers are correctly serving that zone regardless of where
> it is in the DNS heirarchy.  Failure to do that causes additional
> work for recursive servers.  If you don't want to serve a zone then
> remove the delegation.

You are assuming that an authoritative server operator has some way to
know all the zones people delegate to their servers, and remove such
delegations if they don't want to handle them.  That is a wrong

Chris Adams <cma at cmadams.net>