Very interesting data indeed -- and a testament to the accuracy of the 
SpamAssassin rules weighting process.

On Dec 16, 2009, at 4:10 PM, Warren Togami wrote:

> While whitelists are not directly effective (statistically, when averaged 
> across a large corpus), whitelists are powerful tools in indirect ways 
> including:
> * Pushing the score beyond the auto-learn threshold for things like Bayes to 
> function without manual intervention.
> * The albeit controversial method where some automated spam trap blacklists 
> use whitelists to help determine if they really should list an IP address.

Another indirect benefit (according to other users of our whitelists) is that 
when they implement a new spam-blocking method, the whitelists serve as kind of 
a safety valve to let legitimate mail through even when the new rule turns out 
to have false positives.

Site-specific whitelists are important for this, too.

> That being said, whitelists should be constantly policed to maintain their 
> reputation and trust levels.


J.D. Falk <>
Return Path Inc

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