DomainKeys Identified Mail, or DKIM, is a system for validating the authenticity of an email message by using an e-signature. When DKIM is activated for a particular domain, a public encryption key is published to the global DNS system and a private one is kept on the mail server. When a new email is sent, a signature is issued using the private key and when the email message is received, that signature is verified by the POP3/IMAP server using the public key. In this way, the recipient can easily tell if the email message is legitimate or if the sender’s email address has been spoofed. A mismatch will occur if the content of the email message has been altered on its way as well, so DKIM can also be used to make sure that the sent and the delivered messages are identical and that nothing has been attached or removed. This email validation system will enhance your email security, as you can validate the legitimacy of the important emails that you receive and your associates can do likewise with the email messages that you send them. Based on the given mail service provider’s policy, an email message that fails the examination may be deleted or may emerge in the receiver’s mailbox with a warning.