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Okay, so I did not have any luck spoofing a Yahoo e-mail. ProtonMail gave the error: "This email has failed its domain's authentication requirements." and flagged it spam. Might try out a few other big ones later.

@frederikstroem I'm not sure what you're trying to do. But this isn't 1990s SMTP anymore. So there are several protocols for verifying sender domain.

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