DKIM, which is short for DomainKeys Identified Mail, is an authentication system, which prevents email headers from being spoofed and email content from being manipulated. This is achieved by attaching an electronic signature to each and every email sent from an email address under a certain domain. The signature is created on the basis of a private key that’s available on the outbound SMTP mail server and it can be validated with a public key, which is available in the global DNS database. In this way, any email with edited content or a forged sender can be spotted by email providers. This method will boost your web safety enormously and you’ll know for sure that any e-mail message sent from a business ally, a bank, and so on, is legitimate. When you send messages, the recipient will also know for sure that you are indeed the one who has sent them. Any email message that appears to be counterfeit may either be tagged as such or may never reach the recipient’s mailbox, based on how the particular provider has decided to cope with such messages.