What is DMARC?

Domain-based Message Authentication, Reporting, and Conformance (DMARC) ties SPF and DKIM alignment to a policy published at _dmarc.yourdomain.

What AuthDNS checks

• Presence of a v=DMARC1 TXT record
• Policy value p=none|quarantine|reject

p=none is useful for monitoring with aggregate reports (rua=). Moving to quarantine or reject is an operational decision after reviewing report data.

Example draft

v=DMARC1; p=none; rua=mailto:dmarc-reports@example.com

Run a DNS check