DomainKeys Identified Mail, or DKIM, is a method for verifying the authenticity of an email using an electronic signature. When DomainKeys Identified Mail is enabled for a certain domain name, a public key is published to the global DNS system and a private one is stored on the email server. If a new email is sent, a signature is generated using the private key and when the message is delivered, the signature is checked by the POP3/IMAP email server using the public key. Thus, the receiver can easily tell if the email is legitimate or if the sender’s email address has been forged. A discrepancy will appear if the content of the email message has been edited 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 attached or erased. This email authentication system will boost your email safety, as you can validate the legitimacy of the important emails that you receive and your colleagues can do likewise with the emails that you send them. Based on the particular email service provider’s adopted policy, an email that fails to pass the test may be deleted or may reach the recipient’s inbox with a warning symbol.