DomainKeys Identified Mail, or DKIM, is a system for validating the legitimacy of an email by using an electronic signature. When DomainKeys Identified Mail is activated for a specific domain name, a public cryptographic key is published to the global Domain Name System and a private one is kept on the mail server. If a new email is sent, a signature is generated using the private key and when the email is delivered, that signature is ‘scanned’ by the incoming mail server using the public key. In this way, the receiver can easily distinguish if the email message is authentic or if the sender’s address has been forged. A mismatch will appear if the content of the email has been modified on its way as well, so DKIM can also be used to ensure that the sent and the delivered email messages are identical and that nothing has been attached or deleted. This email validation system will strengthen your email safety, since you can confirm the legitimacy of the important emails that you receive and your colleagues can do the exact same thing with the messages that you send them. Depending on the particular mail service provider’s policy, an email that fails the examination may be removed or may emerge in the recipient’s inbox with a warning notification.