https://issues.apache.org/SpamAssassin/show_bug.cgi?id=6724

--- Comment #14 from Darxus <[email protected]> 2011-12-13 19:01:28 UTC ---
Steve Freegard pointed out on IRC this additional bit of relevant BCP draft:

http://tools.ietf.org/html/draft-irtf-asrg-bcp-blacklists-10#section-3.4

   Note: In Section 3.4 it is noted that some DNSBLs have shut down in
   such a way to list all of the Internet.  Further, in Section 3.5,
   DNSBL operators MUST NOT list 127.0.0.1.  Therefore, a positive
   listing for 127.0.0.1 SHOULD indicate that the DNSBL has started
   listing the world and is non-functional.  Similarly, a domain-based
   DNSBL SHOULD NOT ever list the reserved domain INVALID, and a
   positive listing for INVALID SHOULD indicate that the DNSBL is non-
   functional.

He also pointed out that it's only a draft.  

There's also:  "If this indicator is missing (query of 127.0.0.2 returns
NXDOMAIN), the DNSBL should be considered non-functional."

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