Bayes Poisoning - How to combat ?

Dhawal Doshy dhawal at NETMAGICSOLUTIONS.COM
Thu Mar 17 04:28:58 GMT 2005

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Try using some rules from rulesemporium, one of them is this:

You could also setup a spam harvesting site OR some fake email-ids for
collecting spam purely for learning and not rely on autolearn=spam.

A small bumping up of the SURBL scores will also do wonders, since bayes
is no more as effective as it used to be.

- dhawal

Venkata Achanta wrote:
> not spam, SpamAssassin (score=1.891, required 2.5,
> BAYES_40 -1.10, HTML_10_20 0.25, HTML_MESSAGE 0.00,
> MIME_HTML_ONLY 0.18, RAZOR2_CF_RANGE_51_100 0.06, RAZOR2_CHECK 1.51,
> URIBL_SBL 1.00)
> I have a bunch of machines running MS and recently the **untagged** spam
> rate has gone up on most of the boxes. After some examination, i found that
> the bayes is getting a negative score in all the spam that is getting
> through, which is a clear symptom of bayes poison.
> Apart from
> -deleting the bayesian DBs everytime and starting over again,
> -Turning off bayes in spamassassin
> Is there a better fix for a situation like that ?
> Thanks much,
> Venkata Achanta

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