What is DMARC?

DMARC builds on SPF and DKIM: a DNS record states what a receiver should do with mail that fails those checks, and where to send aggregate reports. It is defined in RFC 7489.

Primary sources

Specifications cited by the tools below whose own titles define DMARC.

RFC 7489 — DMARCIETF

2 tools that work with DMARC

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Network Tools2

DNS LookupPull every DNS record for a domain at once, check SPF and DMARC, and compare four public resolvers.Email Header AnalyzerPaste raw email headers to map the delivery path, time every hop and read the SPF, DKIM and DMARC results the receiving server recorded.

Related terms

Terms that appear alongside DMARC on the same tools.

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