DomainKeys Identified Mail, or DKIM, is a method for validating the genuineness of an email by using a digital signature. When DomainKeys Identified Mail is enabled for a given domain, a public key is published to the global Domain Name System and a private one is kept on the email server. When a new message is sent, a signature is generated using the private key and when the email message is delivered, the signature is checked by the incoming server using the public key. In this way, the receiver can easily tell if the email message is legitimate or if the sender’s address has been forged. A discrepancy will occur if the content of the email 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 email messages are identical and that nothing has been added or erased. This validation system will boost your email safety, since you can verify the genuineness of the important email messages that you receive and your colleagues can do the same with the messages that you send them. Based on the given email service provider’s policy, an email that fails the test may be deleted or may emerge in the recipient’s inbox with a warning flag.