DomainKeys Identified Mail, or DKIM, is a system for validating the legitimacy of an email by using a digital signature. When DKIM is activated for a specific domain name, a public key is published to the global DNS database and a private one is stored on the mail server. If a new email is sent, a signature is generated using the private key and when the email is delivered, the signature is validated by the incoming email server using the public key. In this way, the receiver can easily tell if the message is authentic or if the sender’s address has been spoofed. A discrepancy will occur if the content of the email message has been edited 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 deleted. This authentication system will boost your email security, as you can confirm the genuineness of the important email messages that you get and your associates can do the exact same thing with the emails that you send them. Based on the particular email service provider’s policy, an email message that fails to pass the test may be erased or may end up in the receiver’s inbox with a warning symbol.