DomainKeys Identified Mail, or DKIM, is a system for checking the genuineness of an email using an e-signature. When DKIM is enabled for a specific domain name, a public key is published to the global Domain Name System and a private one is stored on the mail server. When a new email message is sent, a signature is generated using the private key and when the message is received, the signature is verified by the POP3/IMAP server using the public key. Thus, the recipient can easily recognize if the email is genuine or if the sender’s email address has been spoofed. A discrepancy will appear 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 erased. This validation system will enhance your email safety, since you can confirm the legitimacy of the important emails that you get and your colleagues can do the same with the emails that you send them. Based on the particular mail service provider’s policy, an email message that fails to pass the test may be erased or may emerge in the receiver’s inbox with a warning sign.