DomainKeys Identified Mail, or DKIM, is a system for verifying the genuineness of an email message by using an e-signature. When DKIM is activated for a specific domain name, a public encryption key is published to the global Domain Name System and a private one is kept on the email server. If a new message is sent, a signature is issued using the private key and when the email message is received, that signature is authenticated by the incoming mail server using the public key. In this way, the recipient can easily know if the message is authentic or if the sender’s address has been spoofed. A discrepancy will appear if the content of the email has been altered on its way as well, so DomainKeys Identified Mail can also be used to make sure that the sent and the delivered emails are identical and that nothing has been attached or removed. This email authentication system will boost your email security, as you can confirm the genuineness of the important emails that you get and your associates can do the exact same thing with the email messages that you send them. Based on the given mail service provider’s adopted policies, a message that fails to pass the check may be deleted or may enter the recipient’s mailbox with a warning symbol.