DNSBLs work to degrade the interoperability of email, to make its
delivery less reliable and system less accountable for failures. They
do NOT meet the "no known technical omissions" criterion required of
standards-track documents.
The fact that they are widely used is sad, not a justification for
standardization.
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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