DKIM, which is short for DomainKeys Identified Mail, is an email validation system, which hinders email headers from being forged and email content from being modified. This is achieved by adding an electronic signature to each and every email message sent from an address under a specific domain name. The signature is published based on a private encryption key that is available on the outgoing SMTP mail server and it can be verified with a public key, which is available in the global Domain Name System. Thus, any message with modified content or a forged sender can be recognized by email providers. This method will heighten your web security immensely and you will be sure that any e-mail 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 be sure that you are indeed the one who has sent them. Any email message that turns out to be forged may either be marked as such or may never end up in the receiver’s mailbox, based on how the particular provider has decided to handle such messages.