DKIM, which is an acronym for DomainKeys Identified Mail, is a validation system, which impedes email addresses from being forged and email content from being manipulated. This is done by adding an e-signature to each and every message sent from an email address under a certain domain. The signature is created based on a private cryptographic key that’s available on the outgoing server and it can be validated using a public key, which is available in the global DNS database. Thus, any message with changed content or a forged sender can be spotted by email providers. This method will boost your online security greatly and you’ll know for sure that any e-mail sent from a business associate, a banking institution, etc., is authentic. When you send out email messages, the receiver will also be sure that you are indeed the one who has sent them. Any mail that appears to be forged may either be labeled as such or may never end up in the recipient’s inbox, based on how the given provider has decided to treat such messages.