DKIM, which is an abbreviation for DomainKeys Identified Mail, is a validation system, which prevents email headers from being forged and email content from being manipulated. This is achieved by attaching a digital signature to every email message sent from an address under a particular domain. The signature is issued on the basis of a private encryption key that is available on the outbound mail server and it can be validated 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 recognized by email service providers. This method will increase your worldwide web safety significantly and you will be sure that any e-mail message sent from a business partner, a banking institution, and so on, is a legitimate one. When you send out email messages, the recipient will also be sure that you are indeed the one who has sent them. Any email that turns out to be counterfeit may either be marked as such or may never end up in the recipient’s mailbox, based on how the given provider has decided to treat such email messages.