To set default values for Anti-Spam engine settings:
In the main window of the application web interface, open the management console tree and select the Settings section and Protection subsection.
In the Anti-Spam Quarantine section, open the Anti-Spam Quarantine settings window by clicking any of the following links: Maximim Quarantine duration, Maximum Anti-Spam Quarantine size or Maximum number of messages in Anti-Spam Quarantine.
In the lower part of the Anti-Spam Quarantine settings window, click the Set default values link.