DMARC Checker
Check whether a domain has a DMARC record, what policy is active, and what to fix next.
Run the checker
Free DMARC checker
What p=none, quarantine, and reject actually mean: p=none observes mail flow, quarantine asks receivers to treat failed mail as suspicious, and reject tells receivers to block mail that fails DMARC alignment.
CHECK YOUR DOMAIN with the DMARC checker, then Open related checker pages for SPF, DKIM, and MX evidence before you change DNS records.
Run full Exposure Report at /exposure-report after the focused DMARC lookup so spoofing risk, TLS, and security headers are reviewed together.
SCANNER-FIRST NEXT STEP: run the full Exposure Report after the DMARC lookup so email authentication, TLS, and security headers are prioritized together.
Why this matters
Check whether a domain has a DMARC record, what policy is active, and what to fix next. The goal is not to create noise. The goal is to turn a visible security signal into a clear next action a business owner, MSP, or IT lead can understand.
What to check
- Confirm the public signal exists and is current.
- Record the evidence in a way another person can validate.
- Separate urgent exposure from normal hygiene work.
- Link the finding to a remediation guide, tool, or assessment.
Recommended workflow
- Run the check or read the assessment criteria.
- Save the visible evidence.
- Decide whether the finding affects email trust, web trust, identity, backup, or compliance evidence.
- Fix the highest-confidence issue first.
- Re-test and document the new result.
Need it fixed rather than just found? See remediation services - flat-scope fixes for email authentication, TLS, and header findings, delivered by a practicing MSP engineer.
Output to keep
| Evidence | Why it matters | Owner |
|---|---|---|
| Current public result | Establishes baseline | IT / MSP |
| Recommended change | Shows next action | Technical owner |
| Retest result | Proves closure | Reviewer |
FAQ
Is the dmarc checker free?
Yes. Breach Horizon content and public-surface checks are designed as free entry points. Some remediation links may be affiliate links and are disclosed.
Does this require internal access?
No. Tool pages are built around public-surface checks and educational guidance unless clearly stated otherwise.
See what attackers see — before they do.
Run the free passive scan, get a prioritized fix plan, and close the gaps yourself or have us do it for you.