DKIM, which is short for DomainKeys Identified Mail, is an authentication system, which impedes email addresses from being spoofed and email content from being modified. This is achieved by adding an electronic signature to each email sent from an address under a particular domain name. The signature is published based on a private encryption key that is available on the outbound SMTP mail server and it can be verified by using a public key, which is available in the global Domain Name System. Thus, any email message with altered content or a spoofed sender can be spotted by email service providers. This technology will increase your online safety significantly and you will know for sure that any e-mail message sent from a business collaborator, a banking institution, and so on, is legitimate. When you send emails, the recipient will also be sure that you are indeed the one who has sent them. Any email that appears to be fraudulent may either be labeled as such or may never be delivered to the receiver’s inbox, based on how the given provider has chosen to deal with such messages.