# DKIM

A signature on each message that proves the domain owner sent it.

**Source:** “Receiving servers use DKIM to verify that the domain owner actually sent the message.” [Email sender guidelines (Gmail Help)](https://support.google.com/mail/answer/81126)

See also: [DMARC](/reference/glossary/dmarc), [SPF](/reference/glossary/spf).

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Published 2026-10-29. Web page: https://www.mackenziebowes.com/reference/glossary/dkim