DKIM, which stands for DomainKeys Identified Mail, is a validation system, which blocks email headers from being spoofed and email content from being meddled with. This is done by attaching an e-signature to every email message sent from an email address under a particular domain name. 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 by using a public key, which is available in the global DNS database. Thus, any email with changed content or a forged sender can be recognized by mail service providers. This method will strengthen your online safety immensely and you’ll know for sure that any email sent from a business collaborator, a banking institution, etc., is a legitimate one. When you send out emails, the receiver will also be sure that you are indeed the one who has sent them. Any email message that appears to be fraudulent may either be labeled as such or may never enter the receiver’s mailbox, depending on how the particular provider has chosen to treat such email messages.