DomainKeys Identified Mail, or DKIM, is a system for verifying the legitimacy of an email using an electronic signature. When DomainKeys Identified Mail is activated for a particular domain, a public encryption key is published to the global DNS database and a private one is stored on the mail server. If a new email message is sent, a signature is generated using the private key and when the email message is received, the signature is verified by the receiving server using the public key. In this way, the recipient can easily distinguish if the email is legitimate or if the sender’s email address has been forged. A discrepancy will appear if the content of the email has been altered in the meantime as well, so DomainKeys Identified Mail can also be used to make sure that the sent and the received messages are identical and that nothing has been attached or deleted. This email authentication system will heighten your email safety, as you can validate the legitimacy of the important emails that you receive and your colleagues can do likewise with the messages that you send them. Based on the particular mail service provider’s policies, an email message that fails the check may be removed or may be delivered to the recipient’s inbox with a warning symbol.