DKIM, which stands for DomainKeys Identified Mail, is an email validation system, which obstructs email headers from being forged and email content from being manipulated. This is achieved by attaching an electronic signature to each message sent from an address under a particular domain. The signature is generated 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. Thus, any email with changed content or a spoofed sender can be spotted by email providers. This technology will strengthen your online security immensely and you’ll know for sure that any e-mail sent from a business associate, a banking institution, and so on, is a genuine one. When you send out email messages, the receiver will also know for sure that you are indeed the one who has sent them. Any email message that turns out to be bogus may either be marked as such or may never enter the receiver’s inbox, based on how the given provider has chosen to cope with such emails.