EMAIL-003: DMARC Policy Audit
- Platform
- Google Workspace
- Category
- Advanced Threat Protection
- Severity
- Critical
- Zero Trust pillar
- Applications & Workloads (weight 2)
- Golden fixtures
- 3
- Branch coverage
- Observed: fixtures prove the verdicts they exercise
- Provenance
- baseline
What it checks
Domain-based Message Authentication, Reporting and Conformance (DMARC) policy must be set to reject or quarantine for all domains. A DMARC policy of none provides no protection against spoofing
Recommended value
DMARC policy set to reject or quarantine for all domains
Remediation
Publish DMARC TXT record at _dmarc.<domain> with p=reject or p=quarantine. Start with p=none for monitoring, then escalate to quarantine and finally reject
Fixture-proven verdicts
Every verdict below is proven by a golden fixture in the module's gating test suite. This table derives from the last green run; it cannot be edited by hand.
| Scenario | Expected verdict |
|---|---|
| clean | PASS |
| known-bad | FAIL |
| throttled | Not Assessed |
Framework mappings
- NIST SP 800-53
- SI-8, SC-7
- CIS Benchmark
- 2.3
- CISA SCuBA
- GWS.GMAIL.4.1v1, GWS.GMAIL.4.2v1
- MITRE ATT&CK
- T1566.001, T1566.002, T1036.005