DomainKeys Identified Mail, or DKIM, is a method for confirming the legitimacy of an email message using an e-signature. When DomainKeys Identified Mail is enabled for a specific domain name, a public encryption key is published to the global Domain Name System and a private one is stored on the email server. When a new message is sent, a signature is issued using the private key and when the email is received, that signature is ‘scanned’ by the incoming POP3/IMAP server using the public key. Thus, the recipient can easily know if the message is genuine or if the sender’s email address has been spoofed. A mismatch will occur if the content of the email has been modified in the meantime as well, so DomainKeys Identified Mail can also be used to make sure that the sent and the delivered emails are identical and that nothing has been attached or removed. This validation system will increase your email safety, as you can validate 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 email provider’s adopted policies, a message that fails to pass the test may be removed or may enter the receiver’s mailbox with a warning symbol.