DKIM, which stands for DomainKeys Identified Mail, is an authentication system, which stops email headers from being spoofed and email content from being modified. This is achieved by adding an electronic signature to every email sent from an address under a certain domain. The signature is issued based on a private key that’s available on the sending server and it can be validated by using a public key, which is available in the global Domain Name System. In this way, any email message with modified content or a forged sender can be recognized by email providers. This method will increase your web security noticeably and you’ll know for sure that any e-mail sent from a business ally, a bank, and so on, is a legitimate one. When you send emails, the recipient will also be sure that you are indeed the one who has sent them. Any email that appears to be forged may either be marked as such or may never end up in the recipient’s mailbox, based on how the particular provider has decided to cope with such email messages.