DomainKeys Identified Mail, or DKIM, is a method for confirming the authenticity of an email using a digital signature. When DKIM is activated for a given domain, a public encryption key is published to the global DNS system and a private one is kept on the email server. When a new message is sent, a signature is generated using the private key and when the email message is delivered, the signature is validated by the incoming email server using the public key. In this way, the recipient can easily recognize if the message is genuine or if the sender’s address has been spoofed. A discrepancy will appear if the content of the email has been modified in the meantime as well, so DKIM can also be used to make sure that the sent and the delivered emails are identical and that nothing has been attached or removed. This validation system will strengthen your email safety, as you can verify the genuineness of the important email messages that you receive and your partners can do the exact same thing with the email messages that you send them. Depending on the particular email service provider’s policies, a message that fails to pass the check may be erased or may enter the recipient’s mailbox with a warning.