DKIM, which stands for DomainKeys Identified Mail, is an authentication system, which prevents email addresses from being forged and email content from being modified. This is achieved by attaching an e-signature to each email message sent from an email address under a particular domain. The signature is generated based on a private encryption key that is available on the SMTP server and it can be verified using a public key, which is available in the global DNS database. In this way, any email message with edited content or a spoofed sender can be recognized by email service providers. This approach will boost your worldwide web security substantially and you’ll know for sure that any email sent from a business ally, a banking institution, etc., is a legitimate one. When you send emails, the recipient 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 flagged as such or may never appear in the recipient’s inbox, based on how the given provider has decided to deal with such emails.