DomainKeys Identified Mail, or DKIM, is a system for verifying the genuineness of an email message by using an electronic signature. When DomainKeys Identified Mail is activated for a specific domain, a public key is published to the global DNS system and a private one is stored on the mail server. When a new email is sent, a signature is issued using the private key and when the message is delivered, the signature is checked by the incoming POP3/IMAP server using the public key. Thus, the receiver can easily discern if the message is genuine or if the sender’s email address has been forged. A discrepancy will occur if the content of the email message has been changed on its way 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 deleted. This authentication system will strengthen your email security, since you can confirm 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 policies, an email message that fails to pass the examination may be deleted or may appear in the receiver’s inbox with a warning notification.