DKIM, which is an abbreviation for DomainKeys Identified Mail, is an email validation system, which impedes email headers from being spoofed and email content from being manipulated. This is achieved by attaching an electronic signature to each email sent from an address under a given domain name. The signature is published on the basis of a private key that is available on the outbound SMTP server and it can be verified by using a public key, which is available in the global DNS database. Thus, any message with modified content or a forged sender can be identified by email service providers. This method will increase your web safety considerably and you will know for sure that any email message sent from a business collaborator, a banking institution, etc., is legitimate. When you send out emails, the receiver will also be sure that you are indeed the one who has sent them. Any email that turns out to be bogus may either be labeled as such or may never be delivered to the receiver’s mailbox, based on how the given provider has decided to deal with such messages.