The Quarantine Plus feature allows you to research the status of messages that have passed through the filtering system in the last 30 days.  From this area you can:

Manage Spam Received in the Past 30 Days

• Search for and view spam messages and raw headers that were caught by the filtering system.
• Release quarantined messages and optionally whitelist (approve) the sender.
• Setup and manage email-based quarantine reports. [ details ]
• Delete spam from the quarantine*.
• View deleted spam*.*Spam is automatically deleted and permanently purged from our servers after 30 days.

Manage Clean Email Received in the Past 30 Days

• View clean messages* and headers that have been received in the last 30 days. [ details ]
• Redeliver any message that arrived within the last 30 days. [ details ]
• View messages that are waiting to deliver. [ details ]
• View delivery status and raw delivery logs for clean messages. [ details ]
• View or re-queue messages that failed to deliver. [ details ]*Only "my quarantine" users can see the body of clean mail.  Clean email is automatically deleted and purged after 30 days.