DKIM, which is an acronym for DomainKeys Identified Mail, is a validation system, which stops email addresses from being spoofed and email content from being manipulated. This is achieved by adding a digital signature to each email message sent from an address under a specific domain name. The signature is issued based on a private cryptographic key that is available on the sending server and it can be verified with a public key, which is available in the global Domain Name System. In this way, any message with altered content or a forged sender can be recognized by email service providers. This technology will increase your web security enormously and you will be sure that any email sent from a business partner, a bank, etc., is authentic. When you send out messages, the receiver will also know for sure that you are indeed the one who has sent them. Any email that turns out to be forged may either be labeled as such or may never enter the recipient’s mailbox, based on how the particular provider has chosen to deal with such emails.