Once you have licensed Anti-Spam, you must activate it to start your appliance-level protection from spam, phishing, and virus messages. You can activate the service and configure it on the Anti-Spam > Settings page.
When Anti-Spam is activated, you can set your preferences. Once these are configured, your email will be filtered and sorted according to your configuration.
Once you have configured Anti-Spam, it will work automatically until you disable it.