DKIM, which is an acronym for DomainKeys Identified Mail, is an email authentication system, which obstructs email headers from being forged and email content from being tampered with. This is done by attaching a digital signature to each message sent from an email address under a particular domain name. The signature is generated based on a private encryption key that’s 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 message with edited content or a forged sender can be identified by email service providers. This method will enhance your online security markedly and you’ll know for sure that any e-mail sent from a business associate, a banking institution, and so on, is legitimate. When you send email messages, the recipient will also be sure that you are indeed the one who has sent them. Any email that turns out to be phony may either be tagged as such or may never reach the recipient’s inbox, depending on how the particular provider has chosen to deal with such email messages.