Do you use anti-spam DNS blocklists? If so, you should probably go take a look at DnsblAccuracy082005 on the SpamAssassin wiki; I’ve collated the results from our recent mass-check rescoring runs for 3.1.0, to produce have up-to-date measurements of the accuracy and hit-rates for most of the big DNS blocklists.
A few highlights:
- highest hit-rate of an IP blocklist: the Distributed Sender Blackhole List, with 39.84% of spam hit
- most accurate IP blocklist: the Spamhaus Exploits Block List, with a miniscule 0.04% false positive rate
- highest hit-rate network test, overall: the OB SURBL list, 51.93% of spam hit
We don’t have accurate figures for the new URIBL.COM lists, btw — only the rulesets that are distributed with SpamAssassin were measured.