The BCP is fairly clear on this, especially when the DNSBL is being shut
down. As the BCP is this >< close to publication (I'm expecting
official notification any minute now), it's way too late to make any
substantive changes to it. However, I was able to slip in a phrase in
to further clarify how an answer outside of 127.0.0.0/8 should be
treated - that was an oversight entirely aside from this issue.
Having a DNSBL return a value _inside_ 127.0.0.0/8 for _all_ queries in
the "go away" case is an extremely bad idea, because many DNSBL clients,
even strict RFC/BCP compliant ones (including my recollections of a
brief glance at SA a few versions ago - I even STR SA treating TXT
records back from SBL-XBL as "listed"), will treat it as "listing the
world".
The DNSBL shutdown process would _also_ be perfectly appropriate for
blocking abusive DNS queries, _without_ listing the world, _and_ by its
very nature shedding the abusive queries.
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