I have not worked how to train the system for mails that you did not get.
We reaaly need a simple white list
http://wiki.apache.org/spamassassin/ManualWhitelist
make some sense however I can not find the user_prefs file
Does Zimbra make use of
the /opt/zimbra/conf/spamassassin/user_pref.template
Is their anything that we need to know before fiddling with this