This functionality is only exposed in the premium product offering. If you'd like to sign up for the premium offering please email firstname.lastname@example.org.
From within the Quarantine settings menu item:
you can control the activation of the quarantine system. This is available via the control panel.
Note: We do NOT recommend changing the defaults settings, the default settings are automatically tuned to provide optimal filtering.
If you disable the quarantine system, emails detected as spam will not be kept in the quarantine system but will be delivered to your email server. Under Subject notation you can mark these messages with a specific subject notation. Note that you can choose to still return a 5xx reject message for messages classified as spam if the quarantine has been disabled.
Every email gets a special header added "X-Recommended-Action: accept" or "X-Recommended-Action: reject". You can filter the message based on this header if quarantine is disabled.