https://issues.apache.org/SpamAssassin/show_bug.cgi?id=6156





--- Comment #21 from Warren Togami <[email protected]>  2009-08-22 14:21:42 
PST ---
Rik van Riel of PSBL recommends that spamassassin should not bother querying
PSBL for any mail older than 2 weeks.  PSBL purges all hosts from the blacklist
if they have hit the spam trap in the previous 2 weeks.  Testing ham or spam
older than 2 weeks is not helpful.

http://ruleqa.spamassassin.org/20090822-r806811-n/RCVD_IN_PSBL/detail
This is confirmed by the nightly --net masscheck.  "set 0, broken down by
message age in weeks".  The SPAM hit rate is 21% only for two weeks, then it
drops off.

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