DKIM, which stands for DomainKeys Identified Mail, is an email authentication system, which obstructs email addresses from being spoofed and email content from being meddled with. This is achieved by adding a digital signature to each message sent from an address under a certain domain name. The signature is created based on a private encryption key that’s available on the outgoing SMTP email server and it can be verified with 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 mail service providers. This method will enhance your web security substantially and you will be sure that any email sent from a business associate, a banking institution, etc., is a legitimate one. When you send messages, the recipient will also be sure that you are indeed the one who has sent them. Any email that turns out to be forged may either be labeled as such or may never end up in the receiver’s mailbox, depending on how the particular provider has decided to cope with such email messages.