How email works: why a fake email from your boss can reach your inbox
DMARC: how a domain tells mail servers what to do with fakes
A fake email can pass two security checks and still use a company's name. Here is the rule a company can publish so that mail servers turn such fakes away.
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Rono now sends his fakes to the customers of the workshop too. At a customer's mail server, one arrives beside a real email from Miva: the same From line, and two passed checks on each.
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The server lets both through. Each passed two checks, and nothing tells it that only one of them really comes from the workshop.
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