DKIM, which is short for DomainKeys Identified Mail, is an email validation system, which prevents email headers from being forged and email content from being modified. This is achieved by adding an e-signature to each email message sent from an email address under a particular domain name. The signature is issued on the basis of a private encryption key that’s available on the outgoing SMTP mail server and it can be verified by using a public key, which is available in the global DNS database. Thus, any email with modified content or a forged sender can be recognized by email service providers. This approach will heighten your web security substantially and you will be sure that any email sent from a business partner, a banking institution, etc., is a legitimate one. When you send out messages, the recipient will also know for sure that you are indeed the one who has sent them. Any email that appears to be bogus may either be marked as such or may never be delivered to the recipient’s mailbox, depending on how the particular provider has chosen to deal with such email messages.