DomainKeys Identified Mail, or DKIM, is a system for checking the legitimacy of an email message using an e-signature. When DomainKeys Identified Mail is enabled for a specific domain name, a public encryption key is published to the global DNS database and a private one is stored on the mail server. If a new message is sent, a signature is generated using the private key and when the email is received, that signature is ‘scanned’ by the receiving server using the public key. In this way, the recipient can easily know if the email is genuine or if the sender’s address has been spoofed. A discrepancy will appear if the content of the email message has been modified 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 added or erased. This validation system will boost your email safety, since you can confirm the genuineness of the important email messages that you get and your colleagues can do the same with the messages that you send them. Depending on the particular email service provider’s policies, an email message that fails to pass the examination may be removed or may be delivered to the receiver’s inbox with a warning notification.