DomainKeys Identified Mail, or DKIM, is a method for validating the genuineness of an email by using an electronic signature. When DKIM is enabled for a certain domain name, a public cryptographic key is published to the global DNS system and a private one is stored on the email server. When a new email message is sent, a signature is issued using the private key and when the email message is delivered, that signature is validated by the incoming POP3/IMAP server using the public key. Thus, the recipient can easily recognize if the message is authentic or if the sender’s email address has been spoofed. A discrepancy will appear 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 received email messages are identical and that nothing has been added or deleted. This validation system will heighten your email safety, since you can confirm the genuineness of the important emails that you receive and your colleagues can do the same with the messages that you send them. Based on the particular email service provider’s policies, an email that fails to pass the check may be erased or may show up in the recipient’s inbox with a warning alert.