Re: [9fans] stubbing

[Charles Forsyth <forsyth@terzarima.net>]

the quality of the blacklists is poor and many entries are completely unrelated
to spam, based on a silly assumption; and it's usually
impossible to correct incorrect data (because the rbl maintainers are morons,
sorry: officious morons). (all right, to be fair, perhaps most are
wonderful and of course i only notice the ones that cause me grief.)

the problem with reverse lookups is that because so many IP addresses
are assigned from bigger blocks, although it's easy to provide A records,
MX, the TXT used for SPF, TXT used for keys, etc., it's often
impossible to provide PTR because the DNS for that isn't under the
same admin as the DNS for names (thanks to DNS design)
and it's often hard even to find the person who could put PTR records
in, or delegate them (and often they don't provide that service).