DMARC record is behind a CNAME loop
CODE REDWhat it means
The CNAME chain at _dmarc.example.com comes back on itself (a.example.com to b.example.com), so resolution never terminates and no policy is ever found.
How to fix it
Remove the circular CNAME and point _dmarc.example.com at a name that resolves to a real TXT record.
Check your own domain
This page describes the condition. To find out whether your domain has it, run the DMARC test or the full checkup, which examines every record at once.
Understand it properly
This page covers one condition. For the whole picture, The DMARC guide, from a first record to enforcement, or start at the Health Library.
Where this comes from
We judge this against RFC 9989 section 4.5. Every finding on this site cites the specification behind it so you can check the work rather than take our word for it.
Other DMARC conditions
DMARC_CNAME_LOOP
Every fix on this site is yours to implement. If you would rather someone did it, I take this work directly.