DMARC Checker

Check DMARC and SPF records for a domain before sending email from newsletters, apps, CRMs, or transactional mail systems.

DMARC

Not checked
Policy
-
Record
-

SPF

Not checked
DNS lookup estimate
-
Record
-

Warnings

  • No check has been run yet.

DMARC policy check

Detect missing records, p=none monitoring mode, malformed tags, pct values, and alignment settings.

SPF syntax check

Review SPF mechanisms such as include, ip4, ip6, a, mx, redirect, and all.

Resolver-backed results

Results come from Convertr server resolvers and should be treated as practical diagnostics, not a global DNS propagation report.

Frequently Asked Questions

Does this send a test email?

No. This tool only checks public DNS TXT records for DMARC and SPF.

Does this check DKIM?

Not yet. DKIM checks require a selector, so this focused checker starts with DMARC and SPF.

Why are reporting addresses redacted?

DMARC rua and ruf values can expose private reporting mailboxes. The checker shows whether those tags exist without exposing the full addresses in JSON output.

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DMARC Checker

Resolve a domain’s current DMARC and related email-authentication DNS records and explain the returned policy fields.

Input
A public domain name.
Output
The resolver response with parsed DMARC, SPF-related, and diagnostic details.
Real limitations
DNS answers can be cached, split across providers, temporarily unavailable, or changed after the lookup; this is not a deliverability guarantee.
Privacy and data handling
a public domain name is sent to Convertr and, when required, the named upstream data service. Do not submit secrets or private URLs. The page does not claim that remote results are complete, permanent, or private to the upstream provider.

How to use this tool

  1. Enter a public domain name and choose the available filters.
  2. Start the lookup and wait for the remote response.
  3. Review the resolver response with parsed DMARC, SPF-related, and diagnostic details; export it only when the page provides an export action.

Common failure modes

NXDOMAIN, resolver timeout, multiple DMARC records, or malformed tags are shown as failures or warnings.

Useful example

Check example.com to inspect its _dmarc TXT record, policy, alignment, percentage, and reporting addresses.