DomainKeys Identified Mail, or DKIM, is a method for validating the authenticity of an email using a digital signature. When DKIM is enabled for a particular domain, a public key is published to the global DNS system and a private one is kept on the mail server. If a new message is sent, a signature is issued using the private key and when the message is received, the signature is validated by the POP3/IMAP email server using the public key. Thus, the recipient can easily recognize if the email message is legitimate or if the sender’s email address has been spoofed. A discrepancy will appear if the content of the email message has been altered in the meantime as well, so DKIM can also be used to make sure that the sent and the delivered email messages are identical and that nothing has been attached or removed. This validation system will boost your email security, since you can validate the authenticity of the important email messages 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 policies, an email message that fails to pass the examination may be deleted or may emerge in the receiver’s inbox with a warning sign.