DomainKeys Identified Mail, or DKIM, is a system for checking the legitimacy of an email message by using a digital signature. When DomainKeys Identified Mail is activated for a certain domain, a public cryptographic key is published to the global Domain Name System and a private one is stored on the email server. When a new email is sent, a signature is issued using the private key and when the email is received, that signature is verified by the incoming email server using the public key. In this way, the recipient can easily recognize if the email is authentic or if the sender’s address has been forged. A mismatch will occur if the content of the email has been modified 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 added or removed. This validation system will boost your email safety, since you can confirm the legitimacy of the important emails that you get and your associates can do likewise with the emails that you send them. Depending on the particular email service provider’s adopted policies, an email that fails to pass the test may be removed or may show up in the receiver’s mailbox with a warning alert.