NOTIMP for unrecognized qtypes

Jacob Hoffman-Andrews jsha at
Thu Jul 27 21:52:01 CEST 2017

Hi all,

I'm trying to write some documentation for users of Let's Encrypt about
CAA. I believe it's the case that standards-conformant authoritative
resolvers should return NOERROR for qtypes they don't recognize, rather
than NOTIMP. Is this correct? If so, what is the relevant standard? I
haven't been able to find a citation in,, or


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