DKIM, which stands for DomainKeys Identified Mail, is an email authentication system, which hinders email headers from being forged and email content from being tampered with. This is done by attaching an electronic signature to each email sent from an email address under a given domain name. The signature is created based on a private cryptographic key that’s available on the SMTP mail server and it can be validated using a public key, which is available in the global DNS database. Thus, any message with edited content or a spoofed sender can be spotted by mail service providers. This method will enhance your worldwide web safety dramatically and you’ll know for sure that any email sent from a business collaborator, a banking institution, and so on, is a genuine one. When you send messages, the receiver will also know for sure that you are indeed the one who has sent them. Any mail that appears to be forged may either be marked as such or may never end up in the receiver’s inbox, based on how the particular provider has decided to handle such messages.