DomainKeys Identified Mail, or DKIM, is a system for verifying the legitimacy of an email using an e-signature. When DomainKeys Identified Mail is activated for a certain domain, a public key is published to the global DNS database and a private one is kept on the email server. When a new email is sent, a signature is issued using the private key and when the email is delivered, that signature is validated by the incoming POP3/IMAP mail server using the public key. Thus, the receiver can easily know if the email is authentic or if the sender’s address has been spoofed. A mismatch will occur if the content of the email message has been modified in the meantime as well, so DKIM can also be used to make sure that the sent and the received emails are identical and that nothing has been attached or deleted. This validation system will heighten your email safety, as you can validate the genuineness of the important emails that you receive and your associates can do the same with the messages that you send them. Based on the particular email service provider’s adopted policy, an email message that fails the test may be removed or may reach the recipient’s inbox with a warning alert.