DKIM, which stands for DomainKeys Identified Mail, is an authentication system, which impedes email addresses from being spoofed and email content from being modified. This is done by attaching an e-signature to every message sent from an address under a particular domain. The signature is created based on a private encryption key that is available on the outbound SMTP mail server and it can be verified with a public key, which is available in the global Domain Name System. Thus, any email with changed content or a forged sender can be recognized by email service providers. This technology will heighten your web security enormously and you’ll be sure that any email message sent from a business ally, a banking institution, and so on, is a genuine one. When you send email messages, the receiver will also be sure that you are indeed the one who has sent them. Any email message that appears to be phony may either be tagged as such or may never appear in the receiver’s inbox, depending on how the particular provider has chosen to cope with such emails.