Deliverability and infrastructure

DMARC

Domain-based Message Authentication, Reporting and Conformance

Definition

DMARC is a DNS policy telling receivers what to do with mail that fails SPF and DKIM alignment for your domain: nothing, quarantine, or reject.

DMARC in practice

DMARC, specified in RFC 7489, is a TXT record at _dmarc.yourdomain.com. It ties SPF and DKIM to the visible From address: a message passes when at least one of them passes and aligns with the From domain. The p= tag sets the policy (none, quarantine or reject) and rua= tells receivers where to send aggregate reports.

Google and Yahoo require a DMARC record for bulk senders, and p=none is enough to meet that requirement. Start at none, read the reports to find every legitimate service sending as you, fix their alignment, then tighten. Publish exactly one DMARC record per domain.

Check your DMARC policyRFC 7489: DMARC

SPFDKIMSending domainDeliverabilityDomain reputationDMARC
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Last updated 2026-10-14 by Ishan Vats.

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