DKIM, which is short for DomainKeys Identified Mail, is an email authentication system, which prevents email addresses from being spoofed and email content from being meddled with. This is achieved by adding a digital signature to every email message sent from an email address under a specific domain. The signature is generated based on a private encryption key that is available on the outbound SMTP email server and it can be validated by using a public key, which is available in the global DNS database. Thus, any email message with edited content or a forged sender can be identified by email providers. This approach will strengthen your online safety noticeably and you will know for sure that any email sent from a business associate, a banking institution, etc., is a legitimate one. When you send email messages, the recipient will also know for sure that you are indeed the one who has sent them. Any mail that turns out to be bogus may either be marked as such or may never show up in the recipient’s mailbox, based on how the given provider has chosen to cope with such messages.