DomainKeys Identified Mail (DKIM) is a validation system used to verify that an e-mail has been sent by an authenticated email server or person. An e-signature is attached to the email message’s header using a private key. When the message is received, a public key that is available in the global Domain Name System is used to check who exactly sent it and whether the content has been altered in some way. The prime task of DomainKeys Identified Mail is to hamper the widely spread scam and spam emails, as it makes it impossible to fake an email address. If an email is sent from an email address claiming to belong to your bank, for instance, but the signature does not correspond, you will either not get the message at all, or you will get it with a warning note that most likely it’s not genuine. It depends on email service providers what exactly will happen with an email which fails to pass the signature examination. DomainKeys Identified Mail will also provide you with an added protection layer when you communicate with your business associates, for example, as they can see that all the messages that you exchange are legitimate and haven’t been manipulated on their way.