What DMARC checks
DMARC is published as a DNS TXT record under _dmarc.yourdomain. A checker can show whether a policy exists, whether it uses p=none, quarantine, or reject, and whether reporting addresses or percentage settings are present.
How SPF and DKIM fit
DMARC depends on alignment with SPF or DKIM. Checking DMARC alone is useful, but email authentication review usually includes SPF, DKIM, MX records, and DNS lookup.
Common mistakes
Do not move directly to a strict policy without understanding legitimate senders. Start carefully, monitor reports, and verify with your email provider.
FAQ
Does DMARC guarantee delivery?
No. It is one signal among many used by receiving mail systems.
Can DNS caches affect results?
Yes. Recent record changes may take time to appear everywhere.