DKIM, which stands for DomainKeys Identified Mail, is an authentication system, which stops email headers from being forged and email content from being modified. This is done by adding an e-signature to each and every message sent from an email address under a specific domain. The signature is created on the basis of a private key that’s available on the outgoing SMTP mail server and it can be verified by 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 identified by email service providers. This method will boost your online security substantially and you will be sure that any email message sent from a business collaborator, a banking institution, and so on, is legitimate. When you send messages, the receiver will also know for 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 reach the receiver’s mailbox, depending on how the given provider has chosen to handle such emails.