DKIM, which is an acronym for DomainKeys Identified Mail, is a validation system, which hinders email addresses from being forged and email content from being manipulated. This is achieved by adding a digital signature to each and every email message sent from an address under a specific domain. The signature is issued based on a private cryptographic key that’s available on the outgoing mail server and it can be validated by using a public key, which is available in the global DNS database. In this way, any email message with modified content or a spoofed sender can be identified by email providers. This method will boost your online security enormously and you will know for sure that any e-mail sent from a business associate, a bank, 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 mail that turns out to be fake may either be flagged as such or may never end up in the recipient’s mailbox, depending on how the given provider has chosen to cope with such messages.