DKIM, which is an acronym for DomainKeys Identified Mail, is an email authentication system, which prevents email headers from being forged and email content from being meddled with. This is done by attaching a digital signature to each and every email message sent from an address under a certain domain. The signature is published on the basis of a private encryption key that is available on the outbound SMTP mail server and it can be validated by using a public key, which is available in the global DNS database. In this way, any message with edited content or a spoofed sender can be recognized by email service providers. This technology will boost your online safety greatly and you’ll know for sure that any email sent from a business associate, a banking institution, etc., is authentic. When you send out email messages, the receiver will also know for sure that you are indeed the one who has sent them. Any email that appears to be fake may either be flagged as such or may never show up in the recipient’s mailbox, depending on how the particular provider has chosen to handle such messages.