[SURBL-Discuss] RFC: significantly reducing FPs on OB

Jeff Chan jeffc at surbl.org
Sat Jul 12 10:41:51 CEST 2008

We can probably significantly reduce the false positives on
ob.surbl.org, the SURBL list based on Outblaze's URI blacklist:


at the cost of some possibly minor false negatives.

SpamAssassin has live (weekly?) statistics about the performance
of their rules, including all SURBL lists, against their ham and
spam corpora at their Rule QA site:


As you can see OB ranks significantly below the other SURBL
lists, with much higher FP rates around 0.1% compared to 0.01% to
0.025% or so.  (Note that the Rule QA site seems to have occasional
glitches, so if the numbers seem out of range one week, check
again later.)

Should we make that change?

Jeff C.

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