DomainKeys Identified Mail, or DKIM, is a system for verifying the genuineness of an email using a digital signature. When DomainKeys Identified Mail is enabled for a certain domain, a public cryptographic 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 issued using the private key and when the message is received, that signature is validated by the incoming email server using the public key. In this way, the receiver can easily recognize if the message is authentic or if the sender’s email address has been spoofed. A mismatch will occur if the content of the email message has been altered in the meantime as well, so DomainKeys Identified Mail can also be used to ensure that the sent and the delivered emails are identical and that nothing has been attached or removed. This validation system will enhance your email safety, as you can verify the genuineness of the important emails that you get and your partners can do the same with the messages that you send them. Depending on the given email service provider’s policies, an email message that fails the check may be removed or may reach the receiver’s mailbox with a warning.