DKIM, which stands for DomainKeys Identified Mail, is an email validation system, which impedes email addresses from being spoofed and email content from being tampered with. This is done by adding an electronic signature to every email message sent from an address under a specific domain name. The signature is generated based on a private cryptographic key that is available on the SMTP email server and it can be validated using a public key, which is available in the global Domain Name System. In this way, any message with changed content or a spoofed sender can be recognized by email providers. This method will enhance your online security substantially and you’ll know for sure that any e-mail sent from a business associate, a banking institution, etc., is a genuine one. When you send 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 forged may either be marked as such or may never be delivered to the recipient’s inbox, based on how the given provider has decided to cope with such emails.