https://issues.apache.org/SpamAssassin/show_bug.cgi?id=6828

--- Comment #6 from RW <[email protected]> ---
(In reply to comment #5)

> tested and using -4 and autolearn only (no manual trainig) on a very mixed
> user base and site wide Bayes has been very reliable..

The trouble with making ham autolearning dependent on DNS whitelists is that
the training can change dramatically with the scores of those rules. If you
started training a while ago when  RCVD_IN_DNSWL_MED scored -4, then you will
have trained on a much wider selection that you if start over now. Currently
you'll be reliant on RCVD_IN_DNSWL_HI and combinations like
RCVD_IN_DNSWL_MED+RCVD_IN_RP_CERTIFIED, which will mean mostly autogenerated
mail from companies like Amazon, and direct marketing mail, but probably almost
no person to person mail. 

Also if someone turns-off DNS whitelists they wont learn any ham at all.

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