DomainKeys Identified Mail, or DKIM, is a method for validating the genuineness of an email message by using a digital signature. When DKIM 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 email server. When a new email message is sent, a signature is generated using the private key and when the message is delivered, the signature is validated by the incoming server using the public key. Thus, the recipient can easily recognize if the message is legitimate or if the sender’s email address has been forged. A discrepancy will occur if the content of the email message has been changed on its way as well, so DomainKeys Identified Mail can also be used to make sure that the sent and the received messages are identical and that nothing has been added or removed. This email validation system will strengthen your email safety, as you can validate the genuineness of the important emails that you receive and your partners can do likewise with the messages that you send them. Depending on the given mail service provider’s policy, an email message that fails the test may be erased or may appear in the receiver’s mailbox with a warning sign.