DKIM, which is an acronym for DomainKeys Identified Mail, is an email validation system, which blocks 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 address under a particular domain name. The signature is published based on a private encryption key that’s available on the outbound SMTP server and it can be verified with a public key, which is available in the global DNS database. Thus, any email message with changed content or a spoofed sender can be identified by mail service providers. This technology will boost your web security considerably and you’ll be sure that any email message sent from a business associate, a banking institution, and so on, is a genuine 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 message that appears to be fake may either be flagged as such or may never reach the receiver’s inbox, depending on how the given provider has decided to treat such email messages.