DomainKeys Identified Mail, or DKIM, is a method for checking the legitimacy of an email message by using an e-signature. When DKIM is activated for a particular domain name, a public cryptographic key is published to the global DNS database and a private one is kept on the email server. If a new message is sent, a signature is issued using the private key and when the message is delivered, the signature is checked by the POP3/IMAP server using the public key. In this way, the receiver can easily know if the message is genuine or if the sender’s address has been forged. A mismatch will appear if the content of the email message has been edited in the meantime as well, so DomainKeys Identified Mail can also be used to ensure that the sent and the delivered messages are identical and that nothing has been attached or erased. This email validation system will strengthen your email safety, as you can verify the authenticity of the important email messages that you receive and your associates can do the exact same thing with the messages that you send them. Depending on the given email service provider’s adopted policies, a message that fails the test may be removed or may be delivered to the recipient’s inbox with a warning.