DomainKeys Identified Mail, or DKIM, is a method for validating the genuineness of an email message using a digital signature. When DomainKeys Identified Mail is enabled for a certain domain, a public cryptographic key is published to the global Domain Name System and a private one is stored on the mail server. If a new email is sent, a signature is issued using the private key and when the email message is delivered, the signature is verified by the POP3/IMAP mail server using the public key. In this way, the receiver can easily recognize if the email is genuine or if the sender’s address has been forged. A mismatch will appear if the content of the email message has been altered in the meantime as well, so DKIM can also be used to ensure that the sent and the received email messages are identical and that nothing has been added or removed. This email authentication system will enhance your email safety, as you can verify the authenticity of the important email messages that you get and your associates can do the same with the emails that you send them. Based on the given mail service provider’s adopted policy, an email message that fails the check may be removed or may enter the recipient’s mailbox with a warning flag.