DKIM, which is an abbreviation for DomainKeys Identified Mail, is an email validation system, which prevents email headers from being forged and email content from being manipulated. This is achieved by adding an electronic signature to every email sent from an address under a specific domain. The signature is generated based on a private cryptographic key that is available on the outgoing email server and it can be verified with a public key, which is available in the global Domain Name System. In this way, any message with altered content or a forged sender can be identified by email service providers. This approach will boost your worldwide web security enormously and you’ll know for sure that any email sent from a business partner, a banking institution, and so on, is genuine. When you send out messages, the receiver will also be sure that you are indeed the one who has sent them. Any mail that turns out to be counterfeit may either be flagged as such or may never appear in the recipient’s inbox, based on how the given provider has decided to cope with such emails.