You can better deal with proxies by caching not just $ENV{'REMOTE_ADDR'} but something like

join '|', $ENV{'REMOTE_ADDR'}, $ENV{'X_FORWARDED_FOR'};

It's not perfect, but it's better than just REMOTE_ADDR on its own.

Update:this was to deal with the issue in false positives from proxies -- as with any sort of tuning of this nature, reducing the false positives can increase the risk of false negatives. (ie, letting more good stuff through has a chance of also letting more bad stuff through). It's up to each person as to which one of the two is worse, and what the acceptable false neg / false pos limits are. You might also try asking at the spamtools or spam-l lists.

In reply to Re^2: Recognizing repetitive spammers using a time base method by jhourcle
in thread Recognizing repetitive spammers using a time base method by Hagbone

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