Cool. I'd split dnsbl_zones into ipv4_dnsbl_zones and ipv6_dnsbl_zones
and have the DnsblZones directive work like;
or similar. IPv6 RBL's do exist, and are incompatible with IPv4 ones, so
it's worth having the support early-on.
I haven't found any examples of IPv6 RBLs. Could you point me to one? What
I'm finding on the web and usenet is that there is still no established
standard for IPv6 blocklists. Unless I can find some reference, any
implementation I make would be a guess so I'm leaving this unsupported