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Advanced Email

How to Set Up a DMARC Record

DMARC builds on SPF and DKIM, telling receiving servers what to do with mail that fails authentication — and sending you reports. Start gently and tighten over time.

Step-by-step

  1. Set up SPF and DKIM first and confirm they are valid — DMARC relies on them (see SPF and DKIM).
  2. Open Domains → Zone Editor and click Manage for your domain.
  3. Add a TXT record with Name _dmarc and a value like:
    v=DMARC1; p=none; rua=mailto:postmaster@yourdomain.com
  4. Start with p=none (monitor only) so you can see reports without affecting delivery.
  5. Review the aggregate reports that arrive at your rua address over a couple of weeks.
  6. Tighten the policy to p=quarantine then p=reject once you confirm legitimate mail passes — see preventing spoofing.

💡 Good to know

  • Never start at p=reject — you could block your own mail before confirming it passes.
  • DMARC reports are XML and easier to read through a free DMARC report viewer.
  • A correct DMARC record also boosts inbox placement at major providers.

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