DMARC Validator

What is DMARC Validator?

A DMARC validator checks that the record published at _dmarc.yourdomain follows RFC 7489. This tool validates the version tag, the policy and subdomain policy, the percentage, alignment modes, failure options and report addresses. It warns about p=none, a missing report address, partial enforcement and subdomain policies that are weaker than the main policy. When report addresses are on another domain, it checks that the destination has published the authorization record that receivers require. It checks the exact name you enter, so a subdomain without its own record may be covered by the record on its organizational domain.

Why use this tool?

• Look up the record at _dmarc on a domain, or paste a record.
• Validates the version, policy, subdomain policy, percentage, alignment, failure options and report addresses.
• Checks that external report destinations have published the required authorization record.
• Warns about monitoring-only policies, partial enforcement and missing report addresses.

How to use DMARC Validator

1. Step 1. Choose Check a domain and enter your domain, or choose Paste a record and paste the value.
2. Step 2. Select Validate DMARC.
3. Step 3. Read the verdict, the table of tags and the messages.
4. Step 4. Fix any problems in DNS and check again.

Common use cases

Important notes

• The tool checks the exact name you enter. A subdomain without its own record may be covered by the record on its organizational domain.
• Receivers ignore DMARC if a domain publishes more than one record at _dmarc.
• The v=DMARC1 tag must come first and the p tag should follow it.
• Unknown tags are ignored by receivers, so a warning usually means a typo.

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