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Deliverability

DKIM

An authentication method that adds a cryptographic signature to verify an email was not altered in transit.

DomainKeys Identified Mail (DKIM) adds a digital signature to outgoing emails that receiving servers can validate against a public key published in the sender's DNS. It proves the message content has not been tampered with and that it genuinely came from the claimed domain. DKIM works alongside SPF and DMARC to strengthen sender authentication.
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