DomainKeys Identified Mail, or DKIM, is a method for confirming the authenticity of an email message by using an e-signature. When DomainKeys Identified Mail is activated for a specific domain name, a public encryption key is published to the global DNS system and a private one is stored on the mail 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 validated by the incoming POP3/IMAP mail server using the public key. In this way, the receiver can easily discern if the message is genuine or if the sender’s address has been forged. A mismatch will occur if the content of the email has been altered on its way as well, so DKIM can also be used to make sure that the sent and the received email messages are identical and that nothing has been added or deleted. This email authentication system will strengthen your email security, since you can verify the legitimacy of the important email messages that you get and your associates can do likewise with the emails that you send them. Based on the particular email service provider’s adopted policy, a message that fails the examination may be erased or may end up in the receiver’s mailbox with a warning.