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Re: uncooperative DNSBLs, was several messages

Keith Moore <moore@network-heretics.com> Thu, 13 November 2008 23:15 UTC

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Date: Thu, 13 Nov 2008 18:15:53 -0500
From: Keith Moore <moore@network-heretics.com>
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To: dcrocker@bbiw.net
Subject: Re: uncooperative DNSBLs, was several messages
References: <Pine.LNX.4.33.0811121942450.12067-100000@egate.xpasc.com> <20081113112302.38928.qmail@simone.iecc.com> <e0c581530811130740g1db5cbfehbcdad361660bf48b@mail.gmail.com> <491C5339.8090801@dcrocker.net>
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Dave CROCKER wrote:

> The difficulty is that the current line of argument is that because some
> DNSBLs are operated badly, DNSBLs are bad.

I have a strong suspicion that poor design of the DNSBL protocol (and/or
its interface to SMTP and NDNs) encourages more badness than is needed.

For instance, what would happen if mail servers provided feedback to
both senders (on a per message basis in the form of NDNs) and recipients
(say, via a web page that listed messages blocked due to DNSBLs)...in
both cases describing which DNSBL blocked the message and what the
blocking criteria were?

What if recipients could disable blocking on a per-DNSBL basis?

Assuming that we're going to have reputation services, I'm looking for
ways to make them more accountable/responsible.

Keith
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