DKIM, which is an abbreviation for DomainKeys Identified Mail, is an email authentication system, which stops email headers from being forged and email content from being manipulated. This is done by attaching an electronic signature to each and every email message sent from an email address under a particular domain name. The signature is created based on a private cryptographic key that’s available on the outgoing SMTP server and it can be validated by using a public key, which is available in the global Domain Name System. Thus, any message with modified content or a forged sender can be recognized by email service providers. This technology will increase your online safety tremendously and you will be sure that any e-mail message sent from a business associate, a banking institution, and so on, is legitimate. When you send out emails, the recipient will also be sure that you are indeed the one who has sent them. Any email message that appears to be counterfeit may either be labeled as such or may never enter the recipient’s mailbox, depending on how the particular provider has decided to deal with such messages.