DKIM, which is an abbreviation for DomainKeys Identified Mail, is a validation system, which blocks email headers from being spoofed and email content from being modified. This is done by adding a digital signature to each message sent from an email address under a given domain name. The signature is issued based on a private key that is available on the outgoing SMTP mail server and it can be validated using a public key, which is available in the global DNS database. Thus, any email message with modified content or a spoofed sender can be recognized by email providers. This approach will enhance your web security immensely and you will know for sure that any email message sent from a business collaborator, a banking institution, and so on, is a legitimate one. When you send out emails, the recipient will also be sure that you are indeed the one who has sent them. Any email that turns out to be fake may either be marked as such or may never be delivered to the recipient’s inbox, depending on how the particular provider has decided to deal with such messages.