How email works: why a fake email from your boss can reach your inbox
DKIM: how a mail server signs the emails it sends
Most emails you get carry a signature you never see. What does that signature prove, and what can it never prove?
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SPF alone did not stop Rono, so Miva adds a second check, one that travels inside the email itself. Here is a real email from her, on its way to a customer. Before it leaves, the workshop's mail server adds one line at its top, a line the customer's phone does not show.
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The line holds a long string of letters and digits, made from the email itself: its From line, its subject and its words.
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