DomainKeys Identified Mail, or DKIM, is a system for verifying the legitimacy of an email using an electronic signature. When DomainKeys Identified Mail is activated for a specific domain, a public key is published to the global DNS database and a private one is kept on the email server. If a new email message is sent, a signature is generated using the private key and when the email message is received, that signature is verified by the incoming server using the public key. In this way, the receiver can easily discern if the email is authentic or if the sender’s email address has been spoofed. A mismatch will appear if the content of the email has been changed on its way 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 deleted. This email validation system will increase your email safety, as you can confirm the genuineness of the important email messages that you get and your colleagues can do the exact same thing with the messages that you send them. Based on the particular email provider’s policy, a message that fails to pass the examination may be deleted or may emerge in the recipient’s mailbox with a warning sign.