DomainKeys Identified Mail, or DKIM, is a method for validating the authenticity of an email by using an e-signature. When DomainKeys Identified Mail is activated for a particular domain, a public cryptographic key is published to the global DNS system and a private one is kept 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 received, that signature is authenticated by the incoming POP3/IMAP server using the public key. In this way, the receiver can easily tell if the message is genuine or if the sender’s email address has been spoofed. A mismatch will occur if the content of the email message has been changed on its way as well, so DomainKeys Identified Mail can also be used to make sure that the sent and the received emails are identical and that nothing has been added or deleted. This email authentication system will heighten your email safety, as you can verify the genuineness of the important emails that you get and your associates can do the same with the email messages that you send them. Depending on the given email provider’s adopted policy, an email that fails the check may be erased or may appear in the recipient’s mailbox with a warning alert.