DomainKeys Identified Mail, or DKIM, is a method for validating the legitimacy of an email message by using an electronic signature. When DomainKeys Identified Mail is enabled for a particular domain name, a public 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 issued using the private key and when the email message is delivered, that signature is validated by the POP3/IMAP mail server using the public key. In this way, the recipient can easily distinguish if the email is authentic or if the sender’s address has been forged. A discrepancy will appear if the content of the email has been edited in the meantime as well, so DKIM can also be used to make sure that the sent and the received emails are identical and that nothing has been attached or deleted. This validation system will boost your email security, since you can verify the genuineness of the important email messages that you get and your colleagues can do the exact same thing with the email messages that you send them. Based on the given email service provider’s policy, a message that fails the examination may be deleted or may be delivered to the receiver’s mailbox with a warning symbol.