DomainKeys Identified Mail, or DKIM, is a method for verifying the legitimacy of an email by using an e-signature. When DomainKeys Identified Mail is enabled for a specific domain, a public encryption key is published to the global Domain Name System and a private one is stored on the email server. If a new message is sent, a signature is issued using the private key and when the email is delivered, that signature is verified by the POP3/IMAP server using the public key. Thus, the receiver can easily distinguish if the message is genuine or if the sender’s address has been spoofed. A discrepancy will occur if the content of the email has been modified in the meantime as well, so DomainKeys Identified Mail can also be used to make sure that the sent and the received email messages are identical and that nothing has been attached or removed. This email validation system will strengthen your email safety, as you can confirm the legitimacy of the important email messages that you receive and your colleagues can do the exact same thing with the messages that you send them. Based on the given mail service provider’s policies, an email that fails to pass the test may be erased or may reach the receiver’s inbox with a warning symbol.