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M365 Email Security and Deliverability Configuration

Enterprise documentation for securing a Microsoft 365 tenant’s email infrastructure — covering authentication protocols, threat protection, identity hardening, and monitoring.

Contents

Document Description
Email Security Configuration Full configuration guide following 8-section enterprise documentation standard
Email Security (PDF) Downloadable PDF version for client delivery

Key Highlights

  • Email Authentication: SPF, DKIM, and phased DMARC enforcement to prevent domain spoofing
  • 9 Defender for Office 365 threat policies including Safe Links, Safe Attachments, Anti-Phishing, and Anti-Malware
  • Plan 1 vs Plan 2 comparison for Microsoft Defender for Office 365 licensing decisions
  • Identity hardening via Entra ID Conditional Access — MFA enforcement and legacy authentication blocking
  • Centralised logging and alerting with Purview audit logs, mailbox auditing, SIEM integration, and security alerts
  • User awareness — Attack Simulation Training and incident response procedures

Documentation Standard

This project follows an 8-section enterprise documentation template:

  1. Name
  2. Purpose
  3. Scope
  4. Configuration Details
  5. Dependencies
  6. Impact
  7. Risks / Considerations
  8. Notes

Author

Prepared by Olu AdelokikiLinkedIn


Generated: 2026-03-22

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Enterprise Microsoft 365 email security configuration covering SPF, DKIM, DMARC authentication, Microsoft Defender for Office 365 threat protection, and Entra ID identity hardening.

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