DomainKeys Identified Mail, or DKIM, is a method for validating the authenticity of an email using an e-signature. When DKIM is activated for a certain domain, a public key is published to the global DNS system and a private one is stored on the email server. If a new email message is sent, a signature is issued using the private key and when the message is delivered, the signature is ‘scanned’ by the POP3/IMAP server using the public key. In this way, the receiver can easily distinguish if the email is genuine or if the sender’s address has been forged. A mismatch will appear if the content of the email message has been changed in the meantime as well, so DomainKeys Identified Mail can also be used to make sure that the sent and the received messages are identical and that nothing has been attached or removed. This validation system will heighten your email safety, as you can validate the genuineness of the important emails that you receive and your partners can do the exact same thing with the email messages that you send them. Based on the particular email service provider’s adopted policy, a message that fails to pass the examination may be deleted or may appear in the recipient’s inbox with a warning.