Sink-holing ad sites with Bind9, but can I allow ads from some defined ‘parent’ sites through?

I’ve successfully implemented the instructions here to create a Bind9 based ad blocker and things work OK… actually they work a little too well. I’m finding some sites like google shopping and Quidco tracking no longer work. Obviously somewhere in the list of sink-holed domains are servers necessary to the operation of these sites. In…

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