You can specify the thresholds for the local quarantine and how you want Mail Security to respond when a threshold is met.
When you establish the quarantine thresholds for the local quarantine, you can specify the following limits:
To establish local quarantine thresholds
In the console on the primary navigation bar, click Monitors.
In the sidebar under Views, click Quarantine Settings.
In the content area, under Quarantine Thresholds, check Maximum number of items, and then type the maximum number of messages or attachments to retain in the quarantine.
To limit the maximum size of the quarantine, do the following:
Check Retain items in quarantine to limit how long an item is quarantined, and then type the number of days.