DKIM, which is an acronym for DomainKeys Identified Mail, is an email validation system, which stops email addresses from being spoofed and email content from being manipulated. This is achieved by adding a digital signature to each and every email message sent from an email address under a certain domain name. The signature is created on the basis of a private cryptographic key that is available on the outgoing SMTP server and it can be validated by using a public key, which is available in the global DNS database. In this way, any email message with changed content or a forged sender can be recognized by email service providers. This method will enhance your online security significantly and you’ll be sure that any e-mail sent from a business associate, a banking institution, etc., 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 mail that appears to be phony may either be tagged as such or may never appear in the receiver’s mailbox, based on how the particular provider has chosen to handle such emails.