DKIM, which is an acronym for DomainKeys Identified Mail, is an authentication system, which stops email headers from being spoofed and email content from being manipulated. This is achieved by adding a digital signature to every email message sent from an email address under a certain domain. The signature is generated on the basis of a private encryption key that’s available on the outgoing mail server and it can be validated using a public key, which is available in the global DNS database. In this way, any email message with changed content or a forged sender can be identified by mail service providers. This method will enhance your online safety tremendously and you will be sure that any e-mail sent from a business collaborator, a bank, etc., is genuine. When you send out email messages, the receiver will also be sure that you are indeed the one who has sent them. Any email that appears to be phony may either be marked as such or may never be delivered to the receiver’s mailbox, depending on how the given provider has chosen to deal with such email messages.