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dmarc PROTOCOLHost: DNSimpleStandard: RFC 7489

How to Configure Domain-based Message Authentication, Reporting, and Conformance (DMARC) on DNSimple

Enforces receiver policy (none, quarantine, reject) when SPF and/or DKIM alignment fails, and generates forensic aggregate reports. Follow this verified implementation guide to deploy standard compliant DMARC DNS records in DNSimple.

Default DMARC Record Syntax

// Authoritative RFC Example
v=DMARC1; p=reject; rua=mailto:dmarc-reports@yourcompany.com; pct=100; aspf=r; adkim=r

Configuration Steps in DNSimple

  1. 1Log in to the DNSimple Dashboard.
  2. 2Click your domain name under the "Domain List".
  3. 3Select "DNS" to view configured records.
  4. 4Click the trash can icon next to the affected CNAME.
  5. 5Confirm the immediate record purging.

Verification Checklist (RFC 7489)

Query DNS TXT record at _dmarc.yourcompany.com.
Ensure valid "p=" policy exists (transition from p=none to p=quarantine to p=reject).
Verify "rua=" tag points to an authenticated inbox or monitoring service.
Check alignment modes (aspf and adkim default to relaxed "r").
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