Common Email Missteps with CUI
Many organizations unknowingly expose CUI through:
- Sending unencrypted attachments
- Failing to classify or tag sensitive data
- Allowing external forwarding or auto-forward rules
- Using commercial email platforms without adequate controls
Even with Microsoft 365, the out-of-the-box configuration may fall short of CMMC and NIST 800-171 requirements unless it's customized properly.
What Secure Email Actually Looks Like
To meet compliance and reduce the risk of CUI leakage, your email system should support:
- End-to-end encryption (like Microsoft Purview Message Encryption)
- Data loss prevention (DLP) to catch sensitive content
- Sensitivity labeling to classify CUI
- External sharing restrictions
- Auditing and alerting for unusual email behaviors
Organizations moving to Microsoft 365 Government Community Cloud High (GCC High) gain access to advanced compliance tools built for CUI, DFARS, and ITAR requirements. But the move isn’t just about features—it’s about aligning technology with enforceable policy.
That’s where GCC High migration services come in. Expert planning and configuration ensure your email system is secure, compliant, and hardened for defense sector expectations.