DomainKeys Identified Mail, or DKIM, is a method for verifying the legitimacy of an email using a digital signature. When DKIM is enabled for a certain domain name, a public encryption key is published to the global Domain Name System and a private one is stored on the email 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 email server using the public key. In this way, the receiver can easily recognize if the email message is genuine or if the sender’s address has been spoofed. A mismatch will occur if the content of the email message has been edited on its way as well, so DomainKeys Identified Mail can also be used to make sure that the sent and the delivered messages are identical and that nothing has been attached or erased. This email validation system will boost your email security, as you can confirm the genuineness of the important email messages that you receive and your associates can do the same with the emails that you send them. Depending on the particular email provider’s adopted policy, a message that fails to pass the test may be removed or may reach the recipient’s mailbox with a warning symbol.