DomainKeys Identified Mail, or DKIM, is a system for checking the authenticity of an email using an e-signature. When DKIM is activated for a particular domain name, a public cryptographic key is published to the global Domain Name System and a private one is stored on the email server. When a new email message is sent, a signature is issued using the private key and when the message is delivered, the signature is authenticated by the incoming POP3/IMAP server using the public key. Thus, the receiver can easily distinguish if the email message is genuine or if the sender’s email address has been spoofed. A mismatch will occur if the content of the email has been edited on its way as well, so DomainKeys Identified Mail 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 email validation system will heighten your email safety, since you can validate the legitimacy of the important emails that you get and your colleagues can do the same with the messages that you send them. Depending on the particular email provider’s adopted policy, a message that fails the examination may be erased or may emerge in the recipient’s inbox with a warning notification.