DKIM, which is short for DomainKeys Identified Mail, is a validation system, which hinders email addresses from being forged and email content from being tampered with. This is achieved by attaching an electronic signature to each and every email message sent from an address under a given domain name. The signature is generated on the basis of a private encryption key that is available on the outbound email server and it can be validated using a public key, which is available in the global Domain Name System. Thus, any message with changed content or a forged sender can be spotted by email service providers. This technology will strengthen your web security immensely and you’ll know for sure that any e-mail message sent from a business ally, a bank, and so on, is authentic. When you send emails, 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 forged may either be tagged as such or may never appear in the recipient’s mailbox, depending on how the given provider has decided to deal with such emails.