How email works: why a fake email from your boss can reach your inbox
SPF records: how a mail server knows which servers may send for a domain
Anyone can type any address in the From line of an email. So how can a mail server tell which servers really send for a company?
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1
After Friday's fake, Miva wants the workshop's mail server to turn emails like Rono's away. For that, it needs a fact it does not have: which servers really send the workshop's email.
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2
It already holds one clue it can trust. A server that talks to it cannot lie about its IP address: every answer goes back to that address, so a server that gave a false one would never get them.
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