DomainKeys Identified Mail, or DKIM, is a system for checking the authenticity of an email using an e-signature. When DKIM is enabled for a particular domain name, a public cryptographic key is published to the global DNS database and a private one is kept on the mail server. If a new email is sent, a signature is issued using the private key and when the message is received, the signature is authenticated by the incoming email server using the public key. Thus, the receiver can easily tell if the email message is authentic or if the sender’s address has been spoofed. A discrepancy will appear if the content of the email message has been altered in the meantime as well, so DomainKeys Identified Mail can also be used to make sure that the sent and the delivered messages are identical and that nothing has been added or removed. This email authentication system will enhance your email security, since you can confirm the authenticity of the important emails that you receive and your associates can do the same with the emails that you send them. Depending on the given mail service provider’s policies, an email message that fails the test may be erased or may emerge in the receiver’s inbox with a warning alert.