DomainKeys Identified Mail, or DKIM, is a method for checking the authenticity of an email message by using a digital signature. When DKIM is activated for a given domain, a public key is published to the global DNS database and a private one is kept on the email server. When a new email is sent, a signature is issued using the private key and when the email is delivered, that signature is verified by the POP3/IMAP email server using the public key. Thus, the receiver can easily distinguish if the message is authentic or if the sender’s email address has been spoofed. A discrepancy will appear if the content of the email message has been altered on its way as well, so DKIM can also be used to make sure that the sent and the delivered emails are identical and that nothing has been added or deleted. This authentication system will increase your email safety, since you can validate the legitimacy of the important email messages that you receive and your partners can do the exact same thing with the messages that you send them. Based on the given email service provider’s adopted policies, a message that fails the examination may be removed or may end up in the receiver’s inbox with a warning notification.