DomainKeys Identified Mail, or DKIM, is a system for confirming the legitimacy of an email by using a digital signature. When DKIM 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. If a new email is sent, a signature is generated using the private key and when the email message is received, the signature is checked by the incoming email server using the public key. Thus, the recipient can easily tell if the message is legitimate or if the sender’s address has been forged. A mismatch will appear if the content of the email has been edited on its way as well, so DomainKeys Identified Mail can also be used to ensure that the sent and the received messages are identical and that nothing has been added or removed. This email validation system will enhance your email security, since you can verify the genuineness of the important email messages that you get and your associates can do the same with the messages that you send them. Based on the particular mail service provider’s adopted policies, a message that fails to pass the check may be erased or may enter the receiver’s inbox with a warning notification.