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DKIM (DomainKeys Identified Mail) is an e-mail authentication method that verifies that the message being sent has not been altered during transmission and is actually sent from an approved domain. This is achieved by adding a digital signature to the headers of outgoing emails, which is then verified by the recipients’ mail servers.
How DKIM works:
- The sending mail server signs the email using the domain private key.
- The receiving server extracts the public key from the sender’s DNS record and uses it to authenticate the signature.
- If the signature is verified, the letter is considered authentic.
Why check DKIM:
- Increased credibility of the sender.
- Protection against spoofing (sender spoofing).
- Improved email deliverability, especially in the case of mass mailings.