DomainKeys Identified Mail, or DKIM, is a method for confirming the authenticity of an email message by using a digital signature. When DomainKeys Identified Mail is enabled for a certain domain name, a public encryption key is published to the global Domain Name System and a private one is kept on the mail server. When a new email is sent, a signature is generated using the private key and when the email message is received, that signature is ‘scanned’ by the incoming mail server using the public key. In this way, the receiver can easily recognize if the email is legitimate or if the sender’s address has been spoofed. A mismatch will occur if the content of the email has been altered on its way as well, so DKIM can also be used to ensure that the sent and the delivered emails are identical and that nothing has been added or deleted. This email validation system will strengthen your email security, as you can validate the genuineness of the important email messages that you get and your partners can do the exact same thing with the emails that you send them. Based on the particular email provider’s adopted policies, an email that fails the check may be deleted or may show up in the recipient’s inbox with a warning alert.