DKIM, which stands for DomainKeys Identified Mail, is a validation system, which impedes email addresses from being forged and email content from being meddled with. This is achieved by adding an e-signature to each email sent from an address under a specific domain. The signature is created based on a private cryptographic key that is available on the outbound SMTP email server and it can be verified with a public key, which is available in the global Domain Name System. Thus, any message with modified content or a forged sender can be identified by email providers. This method will heighten your web security significantly and you will know for sure that any e-mail sent from a business partner, a bank, and so on, is legitimate. When you send out messages, the recipient will also know for sure that you are indeed the one who has sent them. Any mail that appears to be phony may either be marked as such or may never reach the recipient’s inbox, based on how the particular provider has decided to cope with such emails.