DKIM, which is short for DomainKeys Identified Mail, is an email authentication system, which hinders email headers from being forged and email content from being tampered with. This is achieved by attaching an electronic signature to each and every email message sent from an email address under a given domain. The signature is published based on a private cryptographic key that is available on the SMTP email server and it can be verified using a public key, which is available in the global DNS database. In this way, any email message with changed content or a spoofed sender can be spotted by email providers. This technology will heighten your worldwide web safety significantly and you will be sure that any email sent from a business ally, a bank, etc., is legitimate. When you send email messages, the receiver will also know for sure that you are indeed the one who has sent them. Any mail that turns out to be fake may either be tagged as such or may never show up in the recipient’s mailbox, depending on how the given provider has decided to handle such messages.