DKIM, which is short for DomainKeys Identified Mail, is a 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 and every message sent from an email address under a given domain name. The signature is created on the basis of a private key that is available on the SMTP server and it can be validated by using a public key, which is available in the global Domain Name System. In this way, any email message with altered content or a forged sender can be identified by email providers. This method will boost your online security tremendously and you will know for sure that any e-mail message sent from a business collaborator, a banking institution, and so on, is genuine. When you send out messages, the recipient will also know for sure that you are indeed the one who has sent them. Any email message that appears to be fraudulent may either be marked as such or may never end up in the recipient’s inbox, depending on how the particular provider has decided to deal with such messages.