DomainKeys Identified Mail, or DKIM, is a method for checking the legitimacy of an email by using an electronic signature. When DKIM is activated for a specific domain, a public encryption key is published to the global DNS system and a private one is stored on the email server. When a new email is sent, a signature is generated using the private key and when the message is delivered, the signature is authenticated by the incoming POP3/IMAP server using the public key. Thus, the receiver can easily tell if the email is genuine or if the sender’s address has been forged. A discrepancy will appear if the content of the email has been edited in the meantime as well, so DomainKeys Identified Mail can also be used to make sure that the sent and the delivered email messages are identical and that nothing has been added or deleted. This validation system will boost your email safety, as you can validate 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 given mail service provider’s policy, an email message that fails the test may be removed or may appear in the receiver’s inbox with a warning alert.