What DMARC is
DMARC is a DNS policy at _dmarc.yourdomain that tells receivers how to handle messages failing SPF and DKIM — and where to send reports.
Why it matters
A DMARC policy protects your domain from spoofing and is increasingly expected by large inbox providers.
Honest note: This checks that a DMARC record exists and shows its policy. It does not audit SPF/DKIM alignment or parse aggregate reports.