DomainKeys Identified Mail, or DKIM, is a system for verifying the genuineness of an email using an electronic signature. When DKIM is enabled for a particular domain name, a public key is published to the global Domain Name System 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 ‘scanned’ by the POP3/IMAP server using the public key. In this way, the recipient can easily tell if the email is genuine or if the sender’s email address has been spoofed. A mismatch will occur if the content of the email message has been edited on its way as well, so DKIM can also be used to ensure that the sent and the received email messages are identical and that nothing has been added or removed. This validation system will boost your email safety, as you can validate the legitimacy of the important emails that you get and your partners can do likewise with the email messages that you send them. Based on the particular mail service provider’s policies, an email that fails the test may be deleted or may appear in the receiver’s mailbox with a warning symbol.