DomainKeys Identified Mail, or DKIM, is a method for confirming the genuineness of an email message using a digital signature. When DomainKeys Identified Mail is activated for a certain domain, a public key is published to the global Domain Name System and a private one is stored on the mail server. If a new message is sent, a signature is issued using the private key and when the email is delivered, the signature is verified by the incoming server using the public key. In this way, the recipient can easily distinguish if the email message is legitimate or if the sender’s email address has been spoofed. A mismatch will appear if the content of the email message has been altered on its way as well, so DomainKeys Identified Mail can also be used to ensure that the sent and the delivered messages are identical and that nothing has been added or erased. This email validation system will strengthen your email safety, as you can confirm the legitimacy of the important email messages that you get and your partners can do the same with the emails that you send them. Depending on the particular email provider’s adopted policy, an email that fails to pass the test may be erased or may be delivered to the recipient’s inbox with a warning sign.