In the Spam quarantine area all the suspicious messages associated with the current domain are stored. It contains the messages that are permanently blocked by the anti-spam system. The messages' search is based on the Subject, Sender or Recipient values. The messages can be deleted or released. If they are released they will appear in the recipient's mail box. The cluster will be trained automatically which messages are legitimate and will release similar ones in the future.
The suspicious messages that are temporary rejected are not included in the quarantine system. Their delivery will be automatically retried by the sending servers.