DKIM, which stands for DomainKeys Identified Mail, is an email authentication system, which hinders email headers from being spoofed and email content from being meddled with. This is done by attaching a digital signature to each and every message sent from an email address under a particular domain. The signature is created based on a private encryption key that’s available on the outgoing SMTP server and it can be verified by using a public key, which is available in the global Domain Name System. In this way, any message with modified content or a forged sender can be spotted by email providers. This method will increase your online safety significantly and you’ll know for sure that any message sent from a business partner, a banking institution, and so on, is an authentic one. When you send out messages, the receiver will also know for sure that you are indeed the one who has sent them. Any email message that appears to be bogus may either be tagged as such or may never show up in the receiver’s inbox, based on how the particular provider has chosen to handle such email messages.