What is DKIM (DomainKeys Identified Mail)?

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What is DKIM (DomainKeys Identified Mail)?

DKIM (DomainKeys Identified Mail) is a method for verifying that an incoming e-mail message is actually from the stated sender, and that the message has not been altered during transit. When DKIM is enabled, the sender digitally signs a message using a private key. The recipient uses DNS to retrieve the sender's public key and verifies the message's signature. If the signature is invalid, then the message is assumed to be forged and therefore spam. DKIM is frequently used in conjunction with SPF.