DKIM, which is an acronym for DomainKeys Identified Mail, is an authentication system, which blocks email addresses from being forged and email content from being tampered with. This is done by attaching an e-signature to each email message sent from an email address under a specific domain name. The signature is created on the basis of a private cryptographic key that is available on the outgoing SMTP email server and it can be validated by using a public key, which is available in the global Domain Name System. Thus, any email message with edited content or a forged sender can be spotted by email providers. This method will enhance your web security dramatically and you will be sure that any message sent from a business ally, a bank, and so on, is authentic. When you send out messages, the receiver will also be sure that you are indeed the one who has sent them. Any email message that turns out to be phony may either be marked as such or may never show up in the recipient’s inbox, depending on how the given provider has decided to handle such messages.