DKIM, which stands for DomainKeys Identified Mail, is an email validation system, which prevents email headers from being forged and email content from being meddled with. This is done by attaching a digital signature to each message sent from an address under a given domain. The signature is generated based on a private cryptographic key that is available on the outgoing SMTP mail server and it can be verified using a public key, which is available in the global Domain Name System. Thus, any message with modified content or a forged sender can be recognized by email service providers. This method will increase your worldwide web security greatly and you’ll know for sure that any e-mail sent from a business ally, a banking institution, and so on, is genuine. When you send out messages, the receiver will also know for sure that you are indeed the one who has sent them. Any mail that appears to be fraudulent may either be flagged as such or may never end up in the receiver’s mailbox, depending on how the given provider has decided to cope with such messages.