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We also encourage you to explore all things Zimbra with our team and members of the community.
Why do you think they are not enabled ? If you check in the Admin GUI you should see whether they are enabled or not ... Or you can check from the command line using
Code:
su - zimbra
zmprov gs `zmhostname` zimbraServiceEnabled
You'll want to familiarize yourself with the techniques in this wiki too, as they will help you to understand, tweak, and improve your spam performance:
Bugzilla
Wiki
Source
How can i enable the anti spam and antivirus modules ? 
Linear Mode
