DomainKeys Identified Mail, or DKIM, is a system for confirming the legitimacy of an email message using a digital signature. When DKIM is enabled for a particular 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 email message is sent, a signature is generated using the private key and when the email message is delivered, that signature is validated by the POP3/IMAP email server using the public key. Thus, the receiver can easily know if the message is genuine or if the sender’s email address has been forged. A discrepancy will appear if the content of the email message has been edited on its way as well, so DomainKeys Identified Mail can also be used to make sure that the sent and the received emails are identical and that nothing has been added or deleted. This email validation system will enhance your email security, as you can validate the legitimacy of the important emails that you get and your partners can do the exact same thing with the email messages that you send them. Depending on the given mail service provider’s adopted policy, an email message that fails the test may be deleted or may appear in the recipient’s mailbox with a warning alert.