How email works: why a fake email from your boss can reach your inbox
Envelope sender vs From: the two sender addresses of every email
Every email carries two sender addresses, and your phone only ever shows you one. Which one does the sender check really look at?
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1
A week later, a new email from "Miva" reaches the workshop's server. The server runs SPF, as it now does for every email, and this time SPF passes.
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2
On your phone, the From line still says miva@woodshop.example, and Rono's server is still not on the workshop's list. Yet the check passed.
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