DKIM, which is an abbreviation for DomainKeys Identified Mail, is an email authentication system, which impedes email headers from being spoofed and email content from being manipulated. This is achieved by adding an electronic signature to every email sent from an email address under a particular domain name. The signature is published based on a private key that is available on the outgoing SMTP email server and it can be validated by using a public key, which is available in the global DNS database. In this way, any message with altered content or a spoofed sender can be recognized by mail service providers. This approach will increase your web security markedly and you’ll be sure that any e-mail sent from a business partner, a banking institution, and so on, is an authentic one. 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 phony may either be tagged as such or may never end up in the receiver’s mailbox, based on how the given provider has decided to deal with such messages.