DomainKeys Identified Mail, or DKIM, is a system for validating the authenticity of an email by using an e-signature. When DomainKeys Identified Mail is activated for a specific domain name, a public encryption key is published to the global DNS system and a private one is kept on the mail server. If a new email message is sent, a signature is generated using the private key and when the email is received, the signature is validated by the incoming server using the public key. In this way, the receiver can easily recognize if the email message is authentic or if the sender’s email address has been spoofed. A mismatch will appear if the content of the email message has been changed in the meantime as well, so DKIM can also be used to ensure that the sent and the delivered messages are identical and that nothing has been attached or removed. This email validation system will heighten your email safety, as you can confirm the legitimacy of the important email messages that you receive and your colleagues can do likewise with the email messages that you send them. Based on the particular mail service provider’s adopted policy, a message that fails the test may be removed or may enter the receiver’s inbox with a warning notification.