--- title: "Module 3 — M365 Security Hardening" description: "Exchange Online Protection tuning, mailbox auditing, Unified Audit Log forwarding, Secure Score baseline, ASR rules, and ASTRAL configuration capture — no new licensing required for E3 clients." eyebrow: "Consulting Module" lead: "Most M365 E3 tenants are running at a fraction of the security their licence already includes. This module extracts that value systematically — tightening the controls that exist, enabling the logging that should be on, and capturing the baseline so drift is detectable from day one." actions: - label: "Get in Touch" url: "/about/#contact" primary: true - label: "View All Modules" url: "/consulting/skills/" --- ## What It Delivers
📧

Exchange Online Protection Tuning

Anti-phishing, anti-malware, and anti-spam policies reviewed and tightened. DKIM, DMARC, and SPF validated. External sender tagging enabled. Auto-forwarding to external addresses blocked — one of the most reliable business email compromise persistence mechanisms.

📒

Mailbox Auditing and UAL Forwarding

Mailbox auditing enabled tenant-wide for all user and admin actions. Unified Audit Log configured for forwarding to SIEM or PULSAR. Every mailbox access, calendar sharing change, and permission modification becomes a searchable, retained event.

📊

Secure Score Baseline and Improvement Plan

Current Secure Score documented with every open recommendation classified: accept, remediate, or mitigate. A realistic 90-day improvement plan targets the highest-impact items within the existing E3 licence — no new spend required to close most gaps.

🛡️

Attack Surface Reduction Rules

ASR rules deployed via Intune in audit mode first, then staged to enforcement. Rules targeting Office macro abuse, credential theft from LSASS, and suspicious process creation — covering the most common malware execution paths without blocking legitimate business workflows.

📸

ASTRAL Baseline Capture

ASTRAL deployed to take a Git-tracked snapshot of the post-hardening configuration. Every subsequent change opens a pull request with a diff and an AI-generated narrative. The hardened state becomes the recoverable baseline — if anything drifts, you know immediately and can restore deterministically.

## No New Licensing Required The full scope of this module is deliverable on Microsoft 365 E3. We do not recommend upgrading to E5 as a condition of delivery. If E5 features would materially improve a specific control, we say so and explain the trade-off — but we do not use the engagement as a licence upsell. ## Scope and Prerequisites | | | |---|---| | **Duration** | 30–60 days | | **Environment** | M365 E3+ | | **Prerequisites** | Global Administrator access; Module 2 (Identity Security) completed or in parallel | | **Natural follow-on** | Module 4 (Data Governance) for sensitivity labels and DLP |

Extract the security your licence already includes

Most E3 tenants leave the majority of their security value unconfigured. This module closes that gap systematically.

Get in Touch View All Modules