donarmstrong.com - Don Armstrong

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Description: Don Armstrong's blog and web pages. Don Armstrong is a Bioinformatician and Debian Developer currently at the University of Illinois at Urbana-Champaign

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I've run into an "interesting" issue with DNSWL (a great whitelisting/blacklisting service) recently. As part of their DNS query abuse/freeloading mitigation, DNSWL blocks DNS queries (or returns results that marks all hosts as high-confidence non-spam sources) for hosts which repeatedly exceed reasonable query limits to help funnel large users to their subscription service.

Requests from my mail host to dnswl via IPv6 started to trigger the more serious mitigation where DNSWL returns bogus results (every result is high confidence that it is not spam).

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