DomainKeys Identified Mail, or DKIM, is a system for verifying the authenticity of an email message using an electronic signature. When DKIM is activated for a certain domain name, a public key is published to the global DNS database and a private one is stored on the email server. When a new email message is sent, a signature is generated using the private key and when the email message is delivered, that signature is authenticated by the POP3/IMAP server using the public key. Thus, the receiver can easily know if the message is authentic or if the sender’s address has been spoofed. 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 ensure that the sent and the received messages are identical and that nothing has been added or removed. This email authentication system will boost your email safety, since you can confirm the authenticity of the important email messages that you receive and your partners can do the exact same thing with the messages that you send them. Based on the given email provider’s adopted policies, a message that fails the test may be deleted or may be delivered to the recipient’s mailbox with a warning notification.