On Sat, 26 May 2012 22:44:54 +0200
Wolfgang Zeikat wrote:

> In an older episode, on 2012-05-26 22:38, Wolfgang Zeikat wrote:
> 
> > We had so many false positives
> 
> Oops, I used your term "false positives" by accident. I and many
> others tend no call false Ham classifications
> false negatives
> (negative scores change the classification towards ham)

It depends on context. He was originally wrong because he wrote
that he was getting false positives in his inbox, which implies a  false
positive in the overall spamassassin result. OTOH RCVD_IN_DNSWL_MED
hitting spam is a false positive in the individual rule which is a
test for ham.

> So:
> We had so many false negatives
> > with that rule, that I - as others who 
> > replied to your post already (see below) - have come to the
> > conclusion that www.dnswl.org is not a reliable source of trust for
> > us and disabled the rule by configuring
> > 
> > score RCVD_IN_DNSWL_MED RBL 0

The OP should probably update his rules first since the rule currently
scores -2.3 rather than -4, and rules haven't been updated since
February. 

I don't think setting it to zero is a good idea, it wont turn-off the
lookup so you might just as well set it to -0.001 and monitor the
rule's performance.  

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