[Mail Server] What is DKIM

DKIM (DomainKeys Identified Mail) is an email authentication method that allows the sender of an email to associate their domain name with the email message. This allows the recipient’s email server to check that the email message is authorized by the sender’s domain and has not been tampered with during transit.

DKIM uses cryptographic signatures and public-key cryptography to verify the authenticity and integrity of email messages. When an email is sent, the sender’s mail server generates a digital signature for the message, which is then added to the email’s headers. The recipient’s mail server retrieves the sender’s public key from a DNS record and uses it to verify the signature. If the signature is valid, the recipient’s mail server can be confident that the email is from the domain it claims to be from and has not been altered in transit.

DKIM is an important tool for preventing spam and phishing attacks, as it allows recipient servers to verify the authenticity of an email and reject messages that fail the DKIM check. It is often used in conjunction with other email authentication methods, such as SPF (Sender Policy Framework) and DMARC (Domain-based Message Authentication, Reporting and Conformance), to provide a more comprehensive approach to email security.

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