DomainKeys Identified Mail, or DKIM, is a method for verifying the authenticity of an email message by using an e-signature. When DKIM is activated for a particular domain, a public key is published to the global Domain Name System and a private one is stored on the email server. If a new email is sent, a signature is generated using the private key and when the email is received, that signature is checked by the incoming server using the public key. Thus, the recipient can easily tell if the email message is legitimate or if the sender’s email address has been forged. A mismatch will occur if the content of the email has been edited on its way as well, so DKIM can also be used to make sure that the sent and the received messages are identical and that nothing has been attached or erased. This authentication system will increase your email safety, as you can verify the legitimacy of the important emails that you get and your colleagues can do likewise with the email messages that you send them. Based on the given mail service provider’s policy, a message that fails to pass the check may be deleted or may appear in the receiver’s mailbox with a warning notification.