Bayes Poisoning - How to combat ?

[Venkata Achanta]

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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