Audit Mailbox Delegation for Financial Services & Banking
How financial services & banking organizations should implement EXT-08 for Microsoft 365 security and compliance.
For financial services & banking companies using Microsoft 365, audit mailbox delegation is a security priority. This guide explains how EXT-08 helps financial services & banking organizations protect their identity infrastructure while meeting industry-specific compliance mandates.
Why Financial Services & Banking Organizations Need This Control
Financial Services & Banking organizations face specific regulatory requirements including soc2, pci-dss, nist-800-53, iso27001. The EXT-08 control helps address these requirements by:
- SendAs permissions on mailboxes are documented
- SendOnBehalf permissions are tracked
- FullAccess mailbox permissions are reviewed
- Delegation changes are monitored
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.
Industry-Specific Considerations
When implementing EXT-08 in a financial services & banking environment, consider:
- **Regulatory requirements**: soc2, pci-dss, nist-800-53 may mandate specific configurations
- **Risk tolerance**: Financial Services & Banking organizations typically have moderate to low risk tolerance
- **Audit frequency**: Plan for regular compliance reviews
- **Documentation**: Maintain detailed records for regulatory inspections
How to Configure
EXT-08 requires the following configuration:
- SendAs permissions on mailboxes are documented
- SendOnBehalf permissions are tracked
- FullAccess mailbox permissions are reviewed
- Delegation changes are monitored
Requires Exchange admin access or Microsoft Graph Reports API
Follow the steps above in your Microsoft Entra admin center to enable this control.
Financial Services Compliance Requirements
Financial Services organizations must comply with these frameworks, all of which address audit mailbox delegation:
Why This Control Matters for Financial Services
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.
Common threats in financial services & banking:
- • Account takeover attacks
- • Insider trading through unauthorized access
- • Wire fraud via business email compromise
For financial services & banking organizations, EXT-08 is a key component of a compliant Microsoft 365 security posture. TrueConfig helps you implement and maintain this control while meeting industry-specific requirements.
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