DKIM, which stands for DomainKeys Identified Mail, is an authentication system, which prevents email headers from being forged and email content from being manipulated. This is achieved by adding an electronic signature to each message sent from an email address under a given domain. The signature is published based on a private cryptographic key that’s available on the outgoing SMTP mail server and it can be verified using a public key, which is available in the global Domain Name System. In this way, any message with altered content or a forged sender can be recognized by email providers. This approach will heighten your worldwide web safety immensely and you’ll be sure that any e-mail sent from a business associate, a banking institution, etc., is genuine. When you send emails, the recipient will also know for sure that you are indeed the one who has sent them. Any mail that turns out to be forged may either be labeled as such or may never enter the recipient’s mailbox, based on how the given provider has chosen to cope with such emails.