[spambayes-dev] Re: spambayes-dev Digest, Vol 12, Issue 15
juntunen at well.com
Fri Apr 16 21:54:22 EDT 2004
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On 04/16/04, Skip Montanaro imposed order on a stream of electrons to say:
>One thing I think we need to be careful of is using test data sets whose
>messages are too old. It's apparent the spammers are a moving target, so
>what worked one or six months ago (or perhaps even a week ago) may not work
>as well today.
You might be surprised. I've saved all the spam I've received since late 2000. In recent months, I set up SpamAssassin 2.6.1 with the default rules and ran everything (some 12K messages) through it. A guy named Terry Sullivan (who knows a _lot_ more about statistics than I do) analyzed them and presented some conclusions about spam volatility at the MIT conference this past January. He composed a summary article about it here:
The upshot was spam changes a lot more slowly than common thought suggests.
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