HOWTO for system wide spamassassin system

[Patrick Nelson]

FC1, cyrus-imapd v2.2.3, spamassassin v2.63

My imap system is working fine and spamassassin is working with it,
however, the bayesian side of learning spam is not setup.  I have a user
named spammy who has a home dir /home/spammy and spamassassin has put
all its files there.  But I'm wanting to have a more automated way to do
bayesian part of learning ham and spam from the existing mailboxes. 
Something like:

inbound spam
 -> postfix
  -> spamassassin 
   -> postfix
    -> cyrus-imap
     -> public spam folder

then...

daily cron
 -> learn spam (adding it to the spammy bayesian db)
 -> learn ham

then maybe...

monthly cron
 -> clean out public spam or email reminding to clean

I have heard of a few different ways to do this but I was really wanting
to follow a step by step.  Does a HOWTO exist to incorporate
spamassassin into a cyrus-imap system to do bayesian learning at the
system level?


---
Cyrus Home Page: http://asg.web.cmu.edu/cyrus
Cyrus Wiki/FAQ: http://cyruswiki.andrew.cmu.edu
List Archives/Info: http://asg.web.cmu.edu/cyrus/mailing-list.html