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Alex Pleiner writes:
> Fellow Spamfighter,
> 
> while preparing some slides for an anti-spam workshop I reread Paul
> Graham's "Will Filters Kill Spam" at
> <http://www.paulgraham.com/wfks.html>.
> 
> Wouldn't the URIs mentioned in Spam be good keys for some kind of
> auto-whitelisting with a similar mechanism as for AWL?
> 
> While the from address is frequently forged, the URIs listed in the mail
> body should not.
> 
> I like Paul's idea to punish the spammers by auto-retrieving those URIs
> but I can imagine lots of collateral damage (spammers include links to
> microsoft.com). Auto-whitelisting those URIs and using this to
> lower/increase the final score would be different.
> 
> Maybe the bayes filter can take URIs into account, but only as part of
> the whole body.
> 
> Am I wrong on this? Is this a practical idea? Do I miss something?

They already are in SpamAssassin 2.60.  They're tokenized heavily,
and it gives appreciably good results in terms of improved accuracy.

- --j.
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