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What are SPF, DKIM and DMARC?

SPF, DKIM and DMARC are DNS-based standards that help receivers trust email.

Last updated November 9, 2026

The short version

SPF, DKIM and DMARC are DNS-based standards that help receivers trust email. SPF lists which servers may send for a domain. DKIM adds a signature that proves a message was not altered. DMARC tells receivers what to do when those checks fail. Without them, more of your mail lands in spam.

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