DKIM, which stands for DomainKeys Identified Mail, is a validation system, which obstructs email headers from being forged and email content from being modified. This is done by attaching an e-signature to every email message sent from an email address under a certain domain name. The signature is generated based on a private key that’s available on the outgoing SMTP mail server and it can be verified using a public key, which is available in the global DNS database. In this way, any email with altered content or a forged sender can be recognized by mail service providers. This technology will boost your worldwide web security dramatically and you will be sure that any e-mail sent from a business partner, a banking institution, etc., is an authentic one. When you send emails, the receiver will also be sure that you are indeed the one who has sent them. Any mail that turns out to be forged may either be tagged as such or may never enter the recipient’s inbox, based on how the given provider has decided to deal with such emails.