DomainKeys Identified Mail

DomainKeys Identified Mail (DKIM) is an authentication system used to prove that an email has been sent by an authenticated email server or individual. An e-signature is added to the message’s header using a private encryption key. When the message is received, a public key that’s available in the global Domain Name System is used to validate who exactly sent it and whether the content has been changed in some way. The primary job of DomainKeys Identified Mail is to obstruct the widely spread scam and spam messages, as it makes it impossible to fake an email address. If an email message is sent from an address claiming to belong to your bank or financial institution, for example, but the signature does not correspond, you will either not receive the email message at all, or you will get it with a notification that most probably it is not authentic. It depends on email service providers what exactly will happen with an email message which fails to pass the signature test. DKIM will also provide you with an additional layer of security when you communicate with your business allies, for instance, since they can see for themselves that all the messages that you exchange are authentic and have not been tampered with on their way.