DomainKeys Identified Mail, or DKIM, is a system for verifying the legitimacy of an email message by using an electronic signature. When DKIM is enabled for a specific domain name, a public cryptographic key is published to the global DNS database and a private one is stored on the email server. If a new email message is sent, a signature is generated using the private key and when the email message is received, that signature is verified by the POP3/IMAP mail server using the public key. In this way, the recipient can easily tell if the email is genuine or if the sender’s email address has been spoofed. A discrepancy will appear if the content of the email message has been edited in the meantime as well, so DKIM can also be used to ensure that the sent and the received messages are identical and that nothing has been attached or erased. This email authentication system will increase your email safety, as you can confirm the legitimacy of the important emails that you get and your associates can do the same with the messages that you send them. Depending on the particular email service provider’s adopted policies, an email message that fails the test may be deleted or may appear in the receiver’s inbox with a warning sign.