DKIM, which is an acronym for DomainKeys Identified Mail, is a validation system, which impedes email headers from being forged and email content from being meddled with. This is done by adding an e-signature to each and every email message sent from an address under a specific domain. The signature is issued based on a private cryptographic key that’s available on the outbound SMTP email server and it can be validated by using a public key, which is available in the global Domain Name System. In this way, any email message with edited content or a forged sender can be recognized by email service providers. This method will strengthen your web security tremendously and you will know for sure that any e-mail sent from a business ally, a banking institution, etc., is a legitimate one. When you send emails, the recipient will also know for sure that you are indeed the one who has sent them. Any email that turns out to be forged may either be tagged as such or may never reach the receiver’s inbox, depending on how the given provider has chosen to deal with such emails.