DomainKeys Identified Mail, or DKIM, is a system for checking the authenticity of an email message by using an e-signature. When DKIM is enabled for a certain domain, a public key is published to the global DNS system and a private one is kept on the mail server. If a new message is sent, a signature is generated using the private key and when the email message is delivered, that signature is verified by the incoming mail server using the public key. In this way, the receiver can easily distinguish if the message is genuine or if the sender’s address has been forged. A discrepancy 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 ensure that the sent and the delivered emails are identical and that nothing has been added or removed. This authentication system will strengthen your email safety, since you can validate the genuineness of the important email messages that you get and your associates can do the same with the emails that you send them. Depending on the particular email provider’s policies, a message that fails the test may be erased or may appear in the recipient’s inbox with a warning symbol.