DKIM, which is short for DomainKeys Identified Mail, is an email authentication system, which impedes email headers from being spoofed and email content from being tampered with. This is achieved by adding an e-signature to every email message sent from an address under a certain domain name. The signature is published based on a private encryption key that is available on the SMTP server and it can be verified by using a public key, which is available in the global Domain Name System. In this way, any message with modified content or a spoofed sender can be spotted by email service providers. This technology will enhance your web safety greatly and you will know for sure that any e-mail message sent from a business ally, a bank, etc., is a legitimate one. When you send out messages, the recipient will also be sure that you are indeed the one who has sent them. Any mail that appears to be forged may either be marked as such or may never appear in the recipient’s mailbox, based on how the given provider has decided to cope with such email messages.