DKIM, which is an acronym for DomainKeys Identified Mail, is an email validation system, which hinders email addresses from being forged and email content from being modified. This is done by attaching an electronic signature to every email message sent from an email address under a particular domain. The signature is published on the basis of a private cryptographic key that’s available on the SMTP server and it can be validated with a public key, which is available in the global DNS database. In this way, any email message with modified content or a forged sender can be recognized by mail service providers. This method will boost your online safety greatly and you will know for sure that any e-mail message sent from a business collaborator, a bank, etc., is genuine. When you send out email messages, the recipient will also be sure that you are indeed the one who has sent them. Any mail that appears to be phony may either be marked as such or may never be delivered to the recipient’s inbox, depending on how the particular provider has chosen to deal with such emails.