DKIM, which is an acronym for DomainKeys Identified Mail, is an email authentication system, which blocks email addresses from being spoofed and email content from being manipulated. This is achieved by attaching a digital signature to each message sent from an email address under a particular domain. The signature is issued on the basis of a private encryption key that’s available on the outgoing SMTP mail server and it can be validated using a public key, which is available in the global Domain Name System. Thus, any message with modified content or a spoofed sender can be spotted by mail service providers. This technology will heighten your online safety enormously and you’ll be sure that any email message sent from a business collaborator, a banking institution, and so on, is a legitimate 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 marked as such or may never enter the receiver’s mailbox, based on how the particular provider has chosen to deal with such emails.