Exchange Online DLP - Block + Override

Microsoft Purview Data Loss Prevention policy demonstrating sensitive information detection, message blocking, notifications, and business justification overrides.

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Lab Overview

This lab demonstrates how Microsoft Purview Data Loss Prevention (DLP) policies detect sensitive information in outbound email, block transmission, provide policy tips to users, and allow approved business justification overrides.

Lab Information

Architecture Flow

1. User creates outbound email.
2. Email contains sensitive information.
3. DLP policy evaluates content.
4. Policy triggers enforcement action.
5. User receives policy tip.
6. Message is blocked or overridden.
7. Compliance events are logged.

Configuration Screenshot

Click the image to view the full-size screenshot.

Example policy configuration showing DLP enforcement settings and rule processing.

Implementation Steps

1. Create a new DLP policy.
2. Select sensitive information types.
3. Configure detection thresholds.
4. Enable policy tips.
5. Configure block and override actions.
6. Publish the policy.
7. Perform user validation testing.
8. Review audit results.

Validation Checklist

• Email containing sensitive data triggers policy.
• Policy tip appears to user.
• Message blocking functions correctly.
• Override option is available.
• Business justification is recorded.
• Audit logs capture policy actions.
• Reports display enforcement activity.

Troubleshooting Guide

effective protection against accidental data loss.

Policy tips improve user awareness.

Override workflows support legitimate business processes.

Audit logs assist with investigations.

Testing should be completed before production deployment.

Issue	Resolution
Policy not triggering	Verify policy has been published and replicated.
No policy tip displayed	Confirm supported Outlook client version.
Override unavailable	Review policy action configuration.
Audit records missing