Along with my multi domain challenge I would like to know if anyone out there has a successful multi user approach. I doubt anyone has. I have learned that Spam Assassin can be multi user but it seems to require rc files in a linux users home directory and that Postfix be setup to use Procmail. This in itself will not work as then the mail gets delivered to local users and not the ones hosted by Zimbra.

So has anyone come up with any clever multi user spam control solution? In case I may not be making sense I am referring to allowing each user the ability to setup individual white and black lists and other rules that override the site wide policy.

Bogofilter and Popmail are popular individual spam tools that are user trained for that user. I know that SA is a wonderful tool and its integration into Zimbra is intended as a site wide spam facility but individual control is always a plus.