|**Messages containing malicious entity not removed after delivery**|Generates an alert when any message containing malicious content (file, URL, campaign, no entity), is delivered to mailboxes in your organization. If this event occurs, Microsoft attempted to remove the infected messages from Exchange Online mailboxes using [Zero-hour auto purge](/microsoft-365/security/office-365-security/zero-hour-auto-purge), but the message wasn't removed due to a failure. Additional investigation is recommended. This policy automatically triggers [automated investigation and response in Office 365](/microsoft-365/security/office-365-security/air-about).|Medium|Yes|Microsoft 365 Business Premium, Defender for Office 365 Plan 1 add-on, E5/G5, or Defender for Office 365 Plan 2 add-on.|
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