DKIM (Domain Keys Identified Mail ) is a email authentication method designed to detect whether mail is sended by authorized mail server or not.

It is doing by adding digital signature to email’s header , this digital signature is verified by receiver mail server.

How DKIM Works ?

  1. Sender Side :
    • The sender mail server generated public-private key.
    • The private key is secured and it’s using for generating email digital signature.
    • The email digital signature is attached with the email’s special type of DKIM header.
  2. Receiver Side :
    • The Receiver Mail Server receive the mail and check the digital signature.
    • The receiver mail server fetch the key from sender mail server’s DNS record. Public key is available in the email.
    • After getting Both key , Verify the Digital signature.
    • If the digital signature is valid , It means the email was sent by authorized mail server and does not spoofed.
    • If the digital signature is not valid , It means the email was sent by unauthorized mail server.

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