As we're planning to use Zimbra to filter spam messages (was being filtered by an edge MTA before) I need to know a few things about spam filtering in Zimbra that I couldn't find anywhere.

1- Is it possible to have "per user" spam rules? Say I want ****** ads, but my colleagues don't; but I still want to have my mail filtered for spam like everybody else.

2- Is it possible to disable the Bayesian filters, but have SpamAssassin filter out spam with other tools?

3- What are the apps provided with Zimbra to manage SpamAssassin?

4- How do we enable DSpam? Is it possible to have both filters running on the same Zimbra MTA?

Thanks in advance for your help and hints.