For contractors, Microsoft 365 is often the identity and email control plane. The baseline is MFA everywhere, separate admin accounts, conditional access rules, mail flow protections, and routine reporting. The goal is repeatable control and evidence—not “perfect settings” that nobody maintains.
Microsoft 365 Baseline for CMMC Contractors: Identity, Email, and Access Controls
Even when contractors have decent firewalls and antivirus, the real risk often sits in identity and email. If your Microsoft 365 tenant is loose, attackers don’t need to “hack the network”—they just sign in.
For service overview, start at CMMC compliance. For implementation support, see MSP / MSSP cybersecurity.
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Baseline 1: MFA everywhere
- All users
- All admins
- All vendor accounts
Baseline 2: Admin separation + least privilege
- Daily user account for normal work
- Admin account used only for admin tasks
- Role-based admin, not global admin “because it’s easier”
Baseline 3: Conditional access (guardrails)
Guardrails reduce account takeover risk even when a password is compromised.
- Block legacy auth
- Require MFA from new locations/devices
- Limit admin access paths
Baseline 4: Email protection and workflow rules
- Anti-phishing policies
- Attachment/link scanning where available
- Out-of-band verification rules for payment/bank changes
Evidence: what to export monthly
- MFA enforcement proof
- Admin roles list
- Sign-in risk and unusual sign-in activity
- Mailbox forwarding rules review
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If you want this baseline implemented and maintained as operations, start with a readiness review and a prioritized plan.
Why this needs operational ownership
Tenant baselines drift over time. People get added, vendors come in, exceptions appear. The solution is a routine. If you want to see how we run that as a managed program, see why Sun Life Tech is different.
Final Thoughts
Identity and email are often the highest-impact controls for contractors. A clean Microsoft 365 baseline reduces real risk and produces evidence that supports readiness.
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👉 MSP / MSSP cybersecurity
👉 CMMC compliance overview
👉 How we keep baselines from drifting
Recommended resources
These pages map directly to the services and next-step resources behind this topic.
FAQ
Quick answers to common questions.
It can cover identity and email controls, but readiness also includes endpoints, logging, backups, documentation, and operational processes.
MFA everywhere plus blocking legacy authentication. Those two changes reduce a large class of account takeover risk.
Use a monthly review routine: admin roles, MFA status, risky sign-ins, mailbox forwarding rules, and exception cleanup.
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