So that's how check_rbl and check_rbl_sub work? I always wondered about that. So what happens if an IP exists in two subzones at the same time?
With SORBS, it's done by returning multiple results for a single query.
host 138.81.106.218.dnsbl.sorbs.net 138.81.106.218.dnsbl.sorbs.net has address 127.0.0.2 138.81.106.218.dnsbl.sorbs.net has address 127.0.0.3
OPM looks like a bit-mask system, so one result can encode 8 different DNSBLs at once.
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