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Yes. If an email comes from alice@gmail and validates to gmail, alice sent it.

It's possible that gmail screwed up and gave Bob access to Alice's account. In this situation, though, Alice still sent it.



Google is not the only email provider in the world, though. Not all email services are global corporations, and we must be careful never to interrupt the services of independent email providers.


If it comes from alice@foobar and validates to foobar, Alice sent it




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