On 10 Nov 2023, at 21:26, Brian Dickson <[email protected]> wrote:

> Perhaps the DNSBL operators could individually or collectively operate 
> resolvers which do that exact thing?

I'm not sure why the answer isn't "MTAs should run local resolvers configured 
in ways that best suit them".

This seems like obvious best practice generally, anyway. Surely nobody wants 
the availability of services they run to be at the whim of someone else's 
uptime if they can easily avoid it.

The general behaviour of resolvers that do query minimisation seems better to 
leave optimised for privacy, not DNSBL lookup efficiency. 


Joe
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