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Where on HIBP can I see the email of the submitter?

It's not available in this case, or every case. When available, you can search "The data was provided by" in https://haveibeenpwned.com/PwnedWebsites

Thanks! Slight correction: only 2 breaches say "provided by" with a source, but a ton of breaches say "provided to" HIBP with a source.