DKIM, which is an abbreviation for DomainKeys Identified Mail, is an authentication system, which stops email addresses from being spoofed and email content from being tampered with. This is done by adding a digital signature to each and every email message sent from an email address under a given domain name. The signature is generated based on a private cryptographic key that is available on the SMTP mail server and it can be verified by using a public key, which is available in the global DNS database. In this way, any email message with edited content or a forged sender can be identified by email service providers. This technology will increase your worldwide web safety immensely and you’ll know for sure that any message sent from a business partner, a bank, etc., is an authentic one. When you send out email messages, the receiver will also know for sure that you are indeed the one who has sent them. Any mail that appears to be fake may either be marked as such or may never appear in the receiver’s inbox, based on how the given provider has decided to deal with such messages.