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Here's how in Outlook https://support.office.com/en-AU/article/get-delivery-and-read-receipt-confirmations-a34bf70a-4c2c-4461-b2a1-12e4a7a92141

No. The view was that email was not proof of identity, it's relatively easy to spoof someone's account so if Real Madrid received an email from Ed Woodward, they'd have no guarantee that it was genuinely from him. Emails have had the facility to show whether a mail has been opened for some time...