DomainKeys Identified Mail, or DKIM, is a method for confirming the legitimacy of an email using an e-signature. When DKIM is enabled for a given domain, a public cryptographic key is published to the global Domain Name System and a private one is kept on the mail server. If a new email is sent, a signature is generated using the private key and when the message is delivered, the signature is validated by the incoming email server using the public key. In this way, the receiver can easily know if the email message is legitimate or if the sender’s email address has been forged. A mismatch will occur if the content of the email message has been modified in the meantime as well, so DomainKeys Identified Mail can also be used to ensure that the sent and the delivered email messages 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 email messages that you get and your colleagues can do the same with the messages that you send them. Based on the particular email service provider’s adopted policy, an email message that fails to pass the check may be removed or may emerge in the receiver’s inbox with a warning flag.