DKIM, which stands for DomainKeys Identified Mail, is an email authentication system, which obstructs email headers from being forged and email content from being tampered with. This is done by attaching an e-signature to each email sent from an address under a specific domain. The signature is published based on a private cryptographic key that is available on the sending server and it can be validated using a public key, which is available in the global Domain Name System. Thus, any email with altered content or a forged sender can be spotted by email service providers. This method will enhance your online safety greatly and you will know for sure that any email sent from a business ally, a banking institution, etc., is a genuine one. When you send out messages, the recipient will also be sure that you are indeed the one who has sent them. Any email message that turns out to be fake may either be flagged as such or may never reach the receiver’s inbox, depending on how the particular provider has decided to deal with such messages.