DKIM, which stands for DomainKeys Identified Mail, is an email validation system, which prevents email headers from being spoofed and email content from being meddled with. This is done by adding a digital signature to each email sent from an email address under a particular domain. The signature is generated based on a private encryption key that’s available on the sending server and it can be verified by using a public key, which is available in the global Domain Name System. In this way, any email message with changed content or a forged sender can be identified by mail service providers. This technology will strengthen your online security dramatically and you will know for sure that any email message sent from a business partner, a bank, etc., is legitimate. When you send out email messages, the receiver will also know for sure that you are indeed the one who has sent them. Any email message that turns out to be counterfeit may either be marked as such or may never end up in the receiver’s inbox, depending on how the particular provider has chosen to treat such emails.