RE: Last Call: draft-irtf-asrg-dnsbl (DNS Blacklists and Whitelists)

["Livingood, Jason" <[e-mail]>]

> Incidentally, although it may still be the conventional 
> wisdom in the IETF that DNSBLs don't work and aren't useful, 
> in the outside world where 95% or more of mail is spam, 
> they're essential tools to run a mail server.  Although there 
> are indeed lots of stupid DNSBLs, those aren't the ones that 
> people use, and there are widely used ones that have 
> vanishingly low false positive rates that let you knock out 
> most of the spam cheaply so you can afford to do more 
> expensive filtering on what's left.  Spamhaus estimates, 
> based on the systems that pay for their data feeds, that 
> there are about 1.4 billion mailboxes whose mail is filtered 
> using their lists, and they're the biggest but hardly the 
> only popular high quality DNSBL.  It's pretty clear that 
> there are a lot more mail systems that do use DNSBLs than don't.

As an operator of a large mail domain, I'd like to reiterate John's
comments above.  DNSBLs work, are very cost (and computationally)
effective, and are in widespread use.

Regards
Jason
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