Hello everyone, we installed Zimbra about 2months ago, and we are still new about it.

We use Zimbra 8 on Ubuntu 12.04

We have about 200 users connected to zimbra, some by the webinterface, some with outlook 2003,2007 or 2010.

Problem is simple

Even if people mark emails as spam, they still seem to received the email from the same spammers.

Is there anyway to check or enhance the spam filter?