DomainKeys Identified Mail, or DKIM, is a method for validating the legitimacy of an email using an e-signature. When DKIM is enabled for a given domain name, a public cryptographic key is published to the global DNS database and a private one is kept on the mail server. If a new email message is sent, a signature is issued using the private key and when the email is delivered, that signature is validated by the receiving server using the public key. Thus, the recipient can easily recognize if the email message is legitimate or if the sender’s email address has been spoofed. A mismatch will occur if the content of the email message has been modified on its way as well, so DomainKeys Identified Mail can also be used to make sure that the sent and the delivered email messages are identical and that nothing has been attached or deleted. This email authentication system will increase your email safety, as you can verify the legitimacy of the important email messages that you receive and your associates can do likewise with the messages that you send them. Based on the given email service provider’s adopted policies, an email message that fails the check may be deleted or may appear in the receiver’s inbox with a warning sign.