> > A user writes an email and sends it to another user. The other user 
> > does not receive the email. This means that deliverability 
> is broken. 
> > The DNSBL is an agent in preventing that delivery.
> 
> Is this unique to DNSBLs? If not, then why does it merit 
> deeper consideration in the context of DNSBLs?

Because the draft
<http://www.ietf.org/internet-drafts/draft-irtf-asrg-dnsbl-07.txt>
that started this discussion has set the context of DNSBLs.
You are right that it also merits deeper consideration in other
contexts.

--Michael Dillon
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