DKIM, which is short for DomainKeys Identified Mail, is an email authentication system, which impedes email headers from being spoofed and email content from being modified. This is done by adding an electronic signature to each and every email sent from an address under a given domain name. The signature is created on the basis of a private encryption key that is available on the SMTP mail server and it can be validated using a public key, which is available in the global DNS database. In this way, any email with changed content or a forged sender can be recognized by email service providers. This approach will heighten your worldwide web security considerably and you will be sure that any email message sent from a business collaborator, a banking institution, etc., is authentic. When you send email messages, the recipient will also be sure that you are indeed the one who has sent them. Any email message that appears to be phony may either be labeled as such or may never reach the receiver’s mailbox, based on how the particular provider has chosen to cope with such email messages.