DKIM, which is an abbreviation for DomainKeys Identified Mail, is an email authentication system, which impedes email addresses from being forged and email content from being tampered with. This is achieved by adding a digital signature to every message sent from an email address under a given domain name. The signature is generated based on a private cryptographic key that’s available on the outgoing SMTP email server and it can be validated by using a public key, which is available in the global Domain Name System. Thus, any email with edited content or a spoofed sender can be identified by email service providers. This method will enhance your online security markedly and you will be sure that any e-mail sent from a business collaborator, a banking institution, etc., is genuine. When you send out emails, the recipient will also know for sure that you are indeed the one who has sent them. Any mail that appears to be fake may either be flagged as such or may never show up in the receiver’s mailbox, depending on how the particular provider has chosen to deal with such messages.