per user Bayesian filtering

[Joe Harvell]

I have Postfix 2.2.10 and SpamAssassin 3.1.3.  I have been trying to
figure out how to set up per-user Bayesian filtering.  Obviously I need
to cause sa-learn to maintain a different database for each user.  My
question is how do I get SpamAssassin to use the DB corresponding to the
recipient of the message?  And if the message is destined to multiple
recipients, each with separate Bayesian DBs, does/can SA score them
separately?