DomainKeys Identified Mail, or DKIM, is a method for validating the authenticity of an email using an e-signature. When DomainKeys Identified Mail is enabled for a specific domain, a public cryptographic key is published to the global Domain Name System and a private one is kept on the email server. When a new email is sent, a signature is generated using the private key and when the email is received, that signature is validated by the incoming POP3/IMAP email server using the public key. In this way, the receiver can easily know if the email is genuine or if the sender’s email address has been spoofed. A discrepancy 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 email messages are identical and that nothing has been added or deleted. This validation system will boost your email security, as you can verify the legitimacy of the important emails that you get and your partners can do the exact same thing with the emails that you send them. Based on the particular email provider’s adopted policies, an email that fails to pass the check may be removed or may end up in the receiver’s mailbox with a warning.