On 10/1/2024 8:58 AM, Bill Cole wrote:

On 2024-09-30 at 16:22:49 UTC-0400 (Mon, 30 Sep 2024 16:22:49 -0400)
joe a <joea-li...@j4computers.com>
is rumored to have said:

    On 9/27/2024 04:05:51, Matus UHLAR - fantomas wrote:

        On 26.09.24 10:27, joe a wrote:

            Maybe I should not ask this, but . . .

            A relatively innocuous member informational email from a
            local town Library (monthly) gets marked as spam as shown
            below.
            The BAYES_99 and BAYES_999 values are something I am
            toying with for other reasons.  Seems odd these should hit
            either one of those tests.

            So, on the one hand I can add them to whitelist and be
            done with it, or I can add
            them to missed HAM for re-learning.

            Which is the best approach?

        so far, both. You may need to relearn multiple their (monthly)
        mails before it has effect.

            X-Spam-Report:
                *  4.1 BAYES_99 BODY: Bayes spam probability is 99 to
            100%
                *      [score: 1.0000]
                *  5.0 BAYES_999 BODY: Bayes spam probability is 99.9
            to 100%
                *      [score: 1.0000]

        You have raised BAYES_99 and BAYES_999 to huge values so I
        recommend to rethink that.

    You some "don't because" examples?   Seems to me, off hand, that
    if it's 99% or 99.9% then a high value does no harm.  Perhaps half
    what I have would be sufficient though.

Bayes is a statistical method and so will always make some errors, as in this case. BY DEFINITION, one in a hundred messages hitting BAYES_99 will be ham, as will one in a thousand that hits BAYES_999.

I can't claim that the default scores are the best possible ones, but they don't result in many false positive *final scores* for most people.


Also, keep in mind that BAYES_999 is an add-on to BAYES_99.  Any message that hits BAYES_999 will also hit BAYES_99.  That is why the default score for BAYES_999 is only 0.2.

The way you have your scores set will ensure that any message that hits BAYES_999 will get 9.1 points added (4.1 + 5.0).  This may or may not work for you, but you should be aware of it.

--
Bowie

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