Know whether Hosted Email Security holds quarantined emails and how long it keeps these quarantined messages.
Hosted Email Security enables you to take control of messages that it has defined as possible spam or quarantined. It automatically deletes messages from the quarantine after 30 days. To view the quarantined messages, you may open the console and navigate to Quarantine > Query. The page allows you to review, delete, or release the messages for further filtering.
For more information on this topic, please refer to this documentation: Understanding Quarantine.