DKIM, which is short for DomainKeys Identified Mail, is an email validation system, which prevents email addresses from being forged and email content from being tampered with. This is done by adding an e-signature to each message sent from an address under a certain domain name. The signature is issued on the basis of a private encryption key that’s available on the SMTP server and it can be validated by using a public key, which is available in the global DNS database. In this way, any email message with edited content or a forged sender can be recognized by email providers. This method will boost your online security tremendously and you will know for sure that any e-mail sent from a business collaborator, a banking institution, and so on, is an authentic one. When you send out emails, the recipient will also know for sure that you are indeed the one who has sent them. Any email that turns out to be fraudulent may either be labeled as such or may never reach the recipient’s inbox, based on how the particular provider has chosen to treat such messages.