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DKIM (DomainKeys Identified Mail)
An email authentication method using cryptographic signatures to verify email legitimacy.
DKIM is an email authentication method that adds a digital signature to outgoing emails, allowing receiving servers to verify the message was sent by an authorized server and wasn't altered in transit. The DKIM public key is published as a TXT DNS record. DKIM works alongside SPF and DMARC to build a strong email authentication stack, reducing spam and phishing associated with a domain.