DomainKeys Identified Mail, or DKIM, is a method for confirming the legitimacy of an email by using a digital signature. When DomainKeys Identified Mail is enabled for a specific domain, a public key is published to the global DNS database and a private one is kept 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. In this way, the recipient can easily recognize if the email is legitimate or if the sender’s address has been forged. A discrepancy will occur if the content of the email has been edited on its way as well, so DomainKeys Identified Mail can also be used to ensure that the sent and the received emails are identical and that nothing has been attached or erased. This email validation system will strengthen your email safety, as you can confirm the genuineness of the important emails that you receive and your colleagues can do likewise with the emails that you send them. Depending on the particular mail service provider’s policy, an email message that fails to pass the check may be deleted or may reach the recipient’s inbox with a warning notification.