DomainKeys Identified Mail, or DKIM, is a method for verifying the authenticity of an email by using an electronic signature. When DKIM is enabled for a specific domain name, a public encryption key is published to the global Domain Name System and a private one is stored on the email server. When a new email message is sent, a signature is issued using the private key and when the email is received, the signature is validated by the incoming POP3/IMAP mail server using the public key. Thus, the recipient can easily recognize if the email is genuine or if the sender’s email address has been spoofed. A discrepancy will occur if the content of the email has been modified on its way as well, so DKIM can also be used to ensure that the sent and the received email messages are identical and that nothing has been attached or deleted. This authentication system will boost your email security, as you can confirm the authenticity of the important emails that you get and your associates can do the same with the emails that you send them. Based on the given email service provider’s adopted policy, an email message that fails to pass the test may be erased or may enter the recipient’s mailbox with a warning flag.