DomainKeys Identified Mail, or DKIM, is a method for checking the authenticity of an email message by using an e-signature. When DomainKeys Identified Mail is activated for a certain domain name, a public cryptographic key is published to the global Domain Name System and a private one is kept on the mail server. When a new email is sent, a signature is generated using the private key and when the message is delivered, that signature is verified by the incoming server using the public key. In this way, the recipient can easily know if the message is legitimate or if the sender’s address has been forged. A mismatch will occur if the content of the email message has been modified in the meantime 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 authentication system will enhance your email safety, as you can validate the genuineness of the important emails that you get and your associates can do likewise with the messages that you send them. Depending on the given mail service provider’s policy, an email message that fails to pass the test may be erased or may appear in the recipient’s mailbox with a warning sign.