Quarantined Messages Access the quarantine in Microsoft 365 Defender > Email & collaboration > Review > Quarantine. Set up quarantine notifications. For more info, see How to configure quarantine permissions and policies. Report messages you believe are false positives. For more info, see How to handle Legitimate emails getting blocked (False Positive), using Microsoft Defender. By default, spam messages are quarantined for 30 days. For details about adjusting the retention period, see Configure anti-spam policies in EOP. The legacy Quarantine portal at the Office 365 Security & Compliance Center is now in the final stages of retirement, so make sure to update any internal training or links to Quarantine. Release quarantined email