DKIM, which stands for DomainKeys Identified Mail, is an email validation system, which obstructs email addresses from being spoofed and email content from being tampered with. This is done by attaching an electronic signature to each email message sent from an address under a given domain. The signature is issued based on a private cryptographic key that’s available on the outbound email server and it can be verified using a public key, which is available in the global Domain Name System. In this way, any email with altered content or a forged sender can be identified by email service providers. This technology will increase your worldwide web security greatly and you will know for sure that any message sent from a business partner, a banking institution, etc., is authentic. When you send out messages, the receiver will also be sure that you are indeed the one who has sent them. Any email that turns out to be fraudulent may either be labeled as such or may never appear in the receiver’s inbox, based on how the particular provider has decided to cope with such email messages.