DKIM, which stands for DomainKeys Identified Mail, is an email authentication system, which blocks email addresses from being forged and email content from being manipulated. This is done by attaching an e-signature to each email sent from an address under a particular domain. The signature is created based on a private cryptographic key that is available on the outbound email server and it can be validated using a public key, which is available in the global DNS database. Thus, any email with modified content or a forged sender can be recognized by email service providers. This technology will increase your online safety significantly and you’ll be sure that any email message sent from a business ally, a bank, and so on, is a legitimate one. When you send email messages, the recipient will also know for sure that you are indeed the one who has sent them. Any email message that turns out to be fraudulent may either be tagged as such or may never be delivered to the receiver’s inbox, depending on how the particular provider has decided to cope with such email messages.