DomainKeys Identified Mail, or DKIM, is a method for validating the authenticity of an email using an electronic signature. When DomainKeys Identified Mail is activated for a certain domain name, a public key is published to the global DNS system and a private one is stored on the email server. If a new email message is sent, a signature is generated using the private key and when the email message is received, that signature is authenticated by the POP3/IMAP email server using the public key. In this way, the recipient can easily recognize if the email message is authentic or if the sender’s email address has been forged. A mismatch will occur if the content of the email has been changed in the meantime as well, so DomainKeys Identified Mail can also be used to ensure that the sent and the delivered email messages are identical and that nothing has been attached or deleted. This validation system will enhance your email safety, as you can validate the genuineness of the important email messages that you receive and your partners can do likewise with the emails that you send them. Depending on the given email provider’s policy, a message that fails the test may be deleted or may enter the recipient’s mailbox with a warning flag.