On Wed, 04 Mar 2015 13:35:55 +0100
Filip Havlí?ek wrote:

> Hi,
> 
> I would like to ask you, how can I *allow **only **legitimate* email 
> addresses (existing users) for bayes learning?

Why send them through SpamAssassin in the first place?
 
> Table bayes_token grow up to 0,5GB right now, because there are 
> thounsands of unknown email addresses like:

That table shouldn't grow without limit , you can run
sa-learn --force-expire from cron to prevent this. You may want to
increase bayes_expiry_max_db_size before to prevent the size plummeting.
Alternately you can expire directly using SQL based on time.

Some people add a timestamp field to the bayes_seen table to expire
entries from SQL. Alternately you can simple empty the table
occasionally,  the information is only needed to reverse or forget
training.

Don't turn-off auto-training unless you have a strategy for replacing
it.

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