Email authentication
Check DMARC
Check the effective DMARC policy, SPF/DKIM alignment settings and reporting destinations.
Enter only the domain, such as example.com – without https://, a path or an email address.
A new check is available every 5 minutes per tool and domain. Until then, you see the saved result.
What the tool accesses
DNS.
How the check works
What exactly is checked?
- Find the DMARC TXT record at the effective lookup location and check that it is unique.
- Evaluate the version, syntax and all explicit or default tags.
- Determine the effective policy for the domain and subdomains, including DKIM/SPF alignment settings.
- Check aggregate and failure reporting destinations, including external DNS authorization.
Assessment
How is the result determined?
A record is usable only if it is unique and syntactically valid. Notices such as p=none, missing aggregate reports or older tags are shown separately from the conformity verdict.
- Checker
1.0.0- What the tool accesses
- DNS
- Technical standards and sources
- RFC 7489, RFC 9989, RFC 9990
A technical snapshot, not a certificate or a delivery guarantee. Methodology public-tools-v1. Reviewed on 20.08.2026.