DomainKeys Identified Mail, or DKIM, is a method for validating the legitimacy of an email using a digital signature. When DomainKeys Identified Mail is activated for a certain domain, a public cryptographic key is published to the global Domain Name 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 message is delivered, the signature is verified by the incoming POP3/IMAP mail server using the public key. Thus, the recipient can easily recognize if the email is authentic or if the sender’s email address has been forged. A discrepancy will appear if the content of the email message has been edited in the meantime as well, so DKIM can also be used to ensure that the sent and the received email messages are identical and that nothing has been attached or erased. This email validation system will strengthen your email safety, since you can confirm the authenticity of the important email messages that you get and your partners can do likewise with the emails that you send them. Based on the particular mail service provider’s policies, an email that fails the check may be deleted or may reach the recipient’s inbox with a warning sign.