EXT-08Moderate
How to Fix: Audit Mailbox Delegation
Step-by-step guide to implement audit mailbox delegation in your Microsoft 365 environment.
15-20 minutes
Estimated Time
4
Steps
medium
Severity
Enhanced Security
Baseline Level
Why This Matters
Mailbox delegation enables users to send email as others or access their mailboxes. Unauthorized delegation can be used for impersonation attacks or to access sensitive communications without detection.
Prerequisites
- 1Global Administrator or appropriate admin role in Microsoft Entra ID
- 2Access to Microsoft Entra admin center (entra.microsoft.com)
Expected Configuration
- SendAs permissions on mailboxes are documented
- SendOnBehalf permissions are tracked
- FullAccess mailbox permissions are reviewed
- Delegation changes are monitored
Remediation Steps
1
Review Current Configuration
Assess your current configuration in Microsoft Entra admin center.
- •Navigate to the relevant section in Entra admin center
- •Document current settings
- •Compare against expected state
2
Plan Implementation
Determine the changes needed to meet the expected configuration.
- •Review expected configuration requirements
- •Identify affected users or resources
- •Plan rollout strategy
3
Implement Changes
Apply the necessary configuration changes.
- •Make required configuration updates
- •Apply to appropriate scope
- •Document changes made
4
Validate and Monitor
Verify the changes are working as expected.
- •Run TrueConfig scan to verify compliance
- •Test affected functionality
- •Set up ongoing monitoring
Related Resources
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