MC711335 — Microsoft Defender for Office 365: Quarantine End User Allow and Block list management

Microsoft Defender for Office 365 is updating the way end users allow and block emails in Exchange Online. The update will allow end users to block emails from unwanted senders and prevent those emails from showing up in their default quarantine view and in their quarantine notifications. The rollout will begin late April 2024 and expect to complete by late June 2024. No action is needed to prepare for this change.