DomainKeys Identified Mail, or DKIM, is a method for checking the legitimacy of an email by using an electronic signature. When DKIM is activated for a specific domain, a public key is published to the global Domain Name System and a private one is kept on the email server. If a new email message is sent, a signature is generated using the private key and when the email is delivered, that signature is validated by the incoming email server using the public key. In this way, the recipient can easily recognize if the email is authentic or if the sender’s address has been spoofed. A discrepancy will occur if the content of the email has been edited in the meantime as well, so DKIM can also be used to ensure that the sent and the delivered messages are identical and that nothing has been added or deleted. This authentication system will increase your email security, as you can verify the legitimacy of the important emails that you get and your partners can do the same with the emails that you send them. Based on the particular email provider’s adopted policy, a message that fails to pass the examination may be removed or may reach the receiver’s inbox with a warning sign.