DKIM (DomainKeys Identified Mail)

A signature on each message, checked against a public key in your DNS.

Your sending service signs messages with a private key; receivers fetch the public key from DNS under a selector name and verify the message was not changed. Unlike SPF, DKIM survives forwarding. 2048-bit RSA keys are the current norm.

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SPF (Sender Policy Framework): A DNS record listing which servers may send email for your domain.
DMARC: The policy that tells receivers what to do when mail fails SPF and DKIM, and where to report.

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DKIM (DomainKeys Identified Mail)

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