> I guess you're using local zones for this - I would look into using RPZ > instead. I haven't tried it myself but hopefully this will get you started: > > https://blog.nlnetlabs.nl/response-policy-zones-in-unbound/
Thanks, Stuart. I can see the advantage of this approach and it looks like someone has already done the work, https://www.geoghegan.ca/unbound-adblock.html
