DKIM, which is short for DomainKeys Identified Mail, is a validation system, which blocks email addresses from being forged and email content from being tampered with. This is done by adding an e-signature to each email sent from an email address under a given domain name. The signature is created based on a private cryptographic key that is available on the outbound email server and it can be validated with a public key, which is available in the global Domain Name System. In this way, any email message with changed content or a spoofed sender can be identified by email providers. This method will increase your worldwide web security enormously and you’ll know for sure that any email sent from a business collaborator, a banking institution, etc., is genuine. 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 phony may either be tagged as such or may never reach the receiver’s mailbox, based on how the particular provider has chosen to treat such emails.