DKIM, which is short for DomainKeys Identified Mail, is an authentication system, which blocks email headers from being forged and email content from being modified. This is achieved by adding an electronic signature to each email sent from an address under a specific domain. The signature is generated on the basis of a private encryption key that is available on the outbound mail server and it can be validated by using a public key, which is available in the global DNS database. In this way, any message with modified content or a spoofed sender can be spotted by mail service providers. This method will boost your worldwide web safety noticeably and you will know for sure that any email sent from a business partner, a bank, etc., is a legitimate one. When you send out emails, the receiver will also be sure that you are indeed the one who has sent them. Any email message that appears to be fake may either be flagged as such or may never enter the receiver’s inbox, depending on how the given provider has chosen to handle such emails.