DKIM, which is an abbreviation for DomainKeys Identified Mail, is an email authentication system, which prevents email addresses from being spoofed and email content from being manipulated. This is done by adding an e-signature to each email sent from an email address under a certain domain. The signature is issued on the basis of a private encryption key that is available on the SMTP server and it can be verified using a public key, which is available in the global Domain Name System. In this way, any email message with altered content or a forged sender can be recognized by mail service providers. This technology will boost your online safety substantially and you’ll be sure that any e-mail message sent from a business partner, a banking institution, and so on, is an authentic one. When you send out emails, the receiver will also know for sure that you are indeed the one who has sent them. Any email that appears to be bogus may either be tagged as such or may never appear in the recipient’s inbox, depending on how the particular provider has chosen to handle such email messages.