DomainKeys Identified Mail, or DKIM, is a system for verifying the genuineness of an email using an e-signature. When DKIM is enabled for a particular domain, a public key is published to the global Domain Name System 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, the signature is checked by the incoming server using the public key. In this way, the receiver can easily recognize if the email is authentic or if the sender’s address has been forged. A discrepancy will appear if the content of the email has been edited on its way 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 attached or deleted. This email validation system will strengthen your email safety, as you can confirm the legitimacy of the important emails that you receive and your colleagues can do the exact same thing with the email messages that you send them. Depending on the given mail service provider’s adopted policy, an email that fails the test may be removed or may end up in the recipient’s inbox with a warning sign.