DKIM, which is an acronym for DomainKeys Identified Mail, is a validation system, which stops email headers from being spoofed and email content from being tampered with. This is achieved by attaching an e-signature to each message sent from an address under a certain domain name. The signature is published based on a private cryptographic key that is available on the outbound SMTP mail server and it can be validated with a public key, which is available in the global DNS database. Thus, any email message with altered content or a forged sender can be recognized by mail service providers. This technology will boost your worldwide web safety tremendously and you will be sure that any e-mail 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 mail that appears to be phony may either be flagged as such or may never be delivered to the receiver’s inbox, based on how the given provider has decided to cope with such messages.