DomainKeys Identified Mail, or DKIM, is a system for verifying the authenticity of an email message using an e-signature. When DomainKeys Identified Mail is enabled for a particular domain name, a public key is published to the global DNS database and a private one is stored on the email server. When a new email is sent, a signature is generated using the private key and when the message is received, the signature is validated by the incoming POP3/IMAP mail server using the public key. Thus, the recipient can easily know if the email is genuine or if the sender’s email address has been spoofed. A discrepancy will occur if the content of the email message has been modified in the meantime as well, so DKIM can also be used to ensure that the sent and the received messages are identical and that nothing has been attached or deleted. This email validation system will boost your email security, since you can validate the genuineness of the important email messages that you get and your associates can do the exact same thing with the email messages that you send them. Based on the particular email provider’s policies, a message that fails the check may be deleted or may appear in the recipient’s mailbox with a warning flag.