Defaults.Exposed › September 2026 census › v10 registry › DMARC reporting
DMARC reporting
Methodology v10 · canonical ID dmarc-reporting · Email Security · scored · census as of September 5, 2026
Reports who's sending mail as you, so you spot abuse and misconfiguration.
Definition
| Canonical ID | dmarc-reporting |
|---|---|
| Category | Email Security |
| Grade impact | Scored, counts toward the grade |
| Pass | The DMARC record includes an aggregate-report address (rua=mailto:…) so the owner receives spoofing reports. |
| Fail | The DMARC record has no rua reporting address, or no DMARC record exists. |
| Example (passing) | v=DMARC1; p=quarantine; rua=mailto:[email protected] |
No-data rule: when this check couldn't be determined for a domain (timeout, SERVFAIL, redacted source) it returns N/A and is excluded from that domain's scoring denominator: "couldn't determine" is never counted as a failure. "Determined absent" is a real fail.
Prevalence across the census
9.80% of graded domains publish a DMARC record with an aggregate-reporting (rua) address (31,037,403 of 316,600,902, as of September 5, 2026).
Census denominator: 316,600,902 graded domains. Aggregates only: never an individual domain's result.
Fix it
Plain-English impact, cost of ignoring it, and step-by-step remediation: defaults.exposed/fix/dmarc
Cite this check
Defaults.Exposed, "DMARC reporting (dmarc-reporting)", Grading Methodology v10 (census as of September 5, 2026). https://defaults.exposed/methodology/dmarc-reporting
Permalink: https://defaults.exposed/methodology/dmarc-reporting ·
All 34 checks: v10 registry ·
Machine-readable: /methodology/checks.json ·
Licence: open data