DMARC

Updated 28 Jul 2026

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def
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  Domain-based Message Authentication, Reporting, and Conformance — an extension built on top of Sender Policy Framework (SPF) and Domain Keys Identified Mail (DKIM)
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how it works
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  the domain owner publishes a DNS TXT policy dictating what receiving mail servers should do with messages that fail SPF/DKIM validation (accept, send to spam, or reject)
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  compliance reports are sent back to the email administrator, showing how the domain's emails are being received
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related
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  Sender Policy Framework (SPF)
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  Domain Keys Identified Mail (DKIM)

Linked references 3