DKIM, which is an abbreviation for DomainKeys Identified Mail, is an email validation system, which obstructs email addresses from being forged and email content from being modified. This is achieved by attaching a digital signature to each message sent from an email address under a particular domain name. The signature is published based on a private cryptographic key that is available on the outgoing SMTP server and it can be verified using a public key, which is available in the global DNS database. In this way, any email with changed content or a spoofed sender can be identified by email service providers. This approach will boost your web security significantly and you’ll know for sure that any message sent from a business ally, a banking institution, and so on, is authentic. When you send email messages, the recipient will also know for sure that you are indeed the one who has sent them. Any email message that turns out to be forged may either be tagged as such or may never enter the receiver’s inbox, based on how the given provider has decided to handle such email messages.