DKIM, which is an abbreviation for DomainKeys Identified Mail, is a validation system, which stops email headers from being spoofed and email content from being tampered with. This is done by attaching an e-signature to each and every message sent from an email address under a specific domain. The signature is issued based on a private cryptographic key that is available on the SMTP mail server and it can be validated with a public key, which is available in the global Domain Name System. Thus, any email message with changed content or a forged sender can be identified by email service providers. This technology will increase your worldwide web security dramatically and you will know for sure that any email message sent from a business collaborator, a bank, etc., is a genuine one. When you send out emails, the receiver will also know for sure that you are indeed the one who has sent them. Any mail that turns out to be phony may either be tagged as such or may never enter the receiver’s inbox, based on how the particular provider has decided to cope with such messages.