DKIM, which is an acronym for DomainKeys Identified Mail, is an authentication system, which hinders email addresses from being forged and email content from being tampered with. This is done by adding an e-signature to each email sent from an address under a particular domain name. The signature is created based on a private encryption key that’s available on the sending server and it can be validated with a public key, which is available in the global Domain Name System. Thus, any email message with changed content or a spoofed sender can be recognized by email service providers. This technology will heighten your online safety significantly and you’ll know for sure that any email message sent from a business associate, a banking institution, etc., is authentic. When you send email messages, the receiver will also know for sure that you are indeed the one who has sent them. Any email that turns out to be forged may either be tagged as such or may never appear in the recipient’s inbox, based on how the given provider has chosen to treat such emails.