No one is forced to use any DNS block list.
Well...true to a first approximation, at least.
Therefor, any harmful effects of the DNSBL can only be because they
are the best alternative currently available.
Uhh...no. At least not unless your "best" includes things like "it's
in place and nobody still here understands how to switch" to cover
cases like machines set up by someone who's left, or something similar
to cover cases where someone just doesn't have time to track down the
better alternatives.
One particular issue brought up in the draft is that the current
block lists don't adequately deal with bot-nets. If the block list
could respond fast enough, each individual bot could be blocked
before it could deliver a substantial amount of spam.
That's a nice theory, but - at least as far as I can tell - nobody
knows how to build a blacklist that's that hairtrigger without blocking
a lot of other stuff too.
And if used in conjunction with grey listing the entire spam run
could be stopped without inducing collateral damage.
Well, except for any non-spam sent from the host(s) in question.
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