Email & Collaboration Security
DMARC Setup for Microsoft 365
Rolling out SPF, DKIM, and DMARC in stages, moving from monitoring to quarantine and then enforcement.
Environment & context
- Microsoft 365 tenant with mixed workloads (Exchange, SharePoint, Teams).
- Licensing: Business Premium / E3-style environment.
- Goal: Improve security without breaking day-to-day work.
Approach
This walkthrough outlines the practical steps taken to design, test, and roll out this control in a live tenant. It focuses on decisions, trade-offs, and lessons learned rather than every click in the portal.
Outcome
Spoofed messages are dramatically reduced and external recipients have higher trust in mail from the organization.
If your environment looks similar and you’d like a tailored version of this project, we can walk through your current state on a short call and map out a realistic path forward.
Project Snapshot
- Tools used: Entra ID, Defender, Intune, Purview (as applicable).
- Timeframe: Typically 2–6 weeks depending on scope.
- Engagement: Assessment → design → pilot → rollout → handover.