DomainKeys Identified Mail

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DomainKeys Identified Mail (DKIM) is a validation system used to certify that an email message has been sent by an authenticated person or server. An electronic signature is attached to the message’s header using a private key. When the message is received, a public key that’s available in the global DNS database is used to confirm who actually sent it and whether the content has been altered in any way. The essential purpose of DKIM is to avert the widely spread spam and scam emails, as it makes it impossible to forge an email address. If an email is sent from an email address claiming to belong to your bank or financial institution, for instance, but the signature doesn’t correspond, you will either not get the email message at all, or you will get it with a warning alert that most likely it is not an authentic one. It depends on email providers what exactly will happen with an email message that fails to pass the signature check. DKIM will also offer you an extra layer of safety when you communicate with your business allies, for example, as they can see that all the e-mail messages that you send are authentic and haven’t been modified in the meantime.