DKIM, which is an abbreviation for DomainKeys Identified Mail, is a validation system, which prevents email headers from being forged and email content from being tampered with. This is achieved by adding an electronic signature to each and every email sent from an address under a particular domain. The signature is issued on the basis of a private cryptographic key that is available on the outbound SMTP mail server and it can be validated by using a public key, which is available in the global DNS database. Thus, any email with edited content or a forged sender can be spotted by mail service providers. This method will heighten your worldwide web safety tremendously and you will be sure that any message sent from a business partner, a bank, etc., is a genuine one. When you send out email messages, the recipient will also be sure that you are indeed the one who has sent them. Any email that turns out to be fraudulent may either be marked as such or may never show up in the recipient’s mailbox, depending on how the particular provider has decided to cope with such messages.