Site Training via Redirect to a spam and/or ham mailbox

[W T Riker]

I suspect someone has already done this somewhere but I can't seem to
come up with the right key words in my search. I'd like to set up spam
and ham mailboxes to which all my users can redirect/bounce errors for
Bayes training for the site. Then I can run sa-learn via cron against a
single mailbox. Can someone point me to some info on this? Thanks.