DKIM, which is an acronym for DomainKeys Identified Mail, is a validation system, which hinders email headers from being forged and email content from being manipulated. This is achieved by adding an electronic signature to every email sent from an address under a given domain. The signature is generated on the basis of a private encryption key that’s available on the outgoing email server and it can be validated with a public key, which is available in the global Domain Name System. In this way, any message with altered content or a spoofed sender can be identified by mail service providers. This approach will increase your web security enormously and you’ll know for sure that any email message sent from a business associate, a bank, etc., is legitimate. When you send out messages, the receiver will also know for 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 mailbox, depending on how the particular provider has decided to treat such emails.