DKIM, which is an acronym for DomainKeys Identified Mail, is an authentication system, which stops email addresses from being spoofed and email content from being manipulated. This is achieved by attaching an e-signature to each message sent from an email address under a specific domain name. The signature is created on the basis of a private cryptographic key that is available on the SMTP mail server and it can be verified using a public key, which is available in the global DNS database. In this way, any message with altered content or a spoofed sender can be recognized by email service providers. This approach will strengthen your worldwide web security noticeably and you will be sure that any e-mail sent from a business partner, a banking institution, etc., is legitimate. When you send out messages, the recipient will also be sure that you are indeed the one who has sent them. Any email message that appears to be bogus may either be labeled as such or may never be delivered to the recipient’s inbox, depending on how the given provider has decided to cope with such emails.