twofers wrote: > I get: > * -1.0 RCVD_IN_DNSWL_LOW RBL: Sender listed at > http://www.dnswl.org/, low > * trust > > and I read the dnswl.org home page, but I don't understand why this > rule would get a -1.0 for a "LOW" trust rating. > > It just seems awkward to me, I think LOW trust would dictate a > positive rating, say a 1.0 or higher. > > Any insights? > >
Low doesn't mean it's a likely spam source, it means it's a nonspam source, but with less confidence than the higher tiers. Regardless, this test performed reasonably well in the 3.2 mass-checks OVERALL SPAM% HAM% S/O RANK SCORE NAME 0.092 0.0058 0.2442 0.023 0.66 -1.00 RCVD_IN_DNSWL_LOW (from http://svn.apache.org/repos/asf/spamassassin/branches/3.2/rules/STATISTICS-set3.txt) With a S/O of 0.023, that means that 97.7% of the email this rule hit was nonspam, and 2.3% was spam. With that S/O, I don't think -1 is an out-of-order score, particularly since the test set was spam biased (63.8% of the test email was spam)
