DKIM, which is an acronym for DomainKeys Identified Mail, is an email validation system, which hinders email headers from being forged and email content from being modified. This is done by attaching an electronic signature to each and every email message sent from an email address under a specific domain name. The signature is issued based on a private cryptographic key that is available on the outbound SMTP server and it can be validated using a public key, which is available in the global DNS database. Thus, any message with changed content or a forged sender can be recognized by email providers. This method will increase your worldwide web safety tremendously and you will know for sure that any message sent from a business collaborator, a bank, etc., is an authentic 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 appears to be fraudulent may either be marked as such or may never end up in the recipient’s mailbox, depending on how the particular provider has decided to treat such messages.