DKIM, which is short for DomainKeys Identified Mail, is an email authentication system, which prevents email headers from being forged and email content from being meddled with. This is achieved by adding a digital signature to each message sent from an address under a certain domain. The signature is generated on the basis of a private cryptographic key that is available on the outbound mail server and it can be validated with a public key, which is available in the global Domain Name System. Thus, any email message with altered content or a spoofed sender can be recognized by mail service providers. This technology will increase your web safety markedly and you’ll know for sure that any email message sent from a business associate, a banking institution, etc., is an authentic one. When you send out email messages, the recipient will also be sure that you are indeed the one who has sent them. Any mail that turns out to be forged may either be labeled as such or may never show up in the receiver’s mailbox, depending on how the given provider has decided to deal with such emails.