Microsoft on-premises server product that runs Office Online.
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Based on my research, the delivery receipt does not involve or alert the person receiving the email. That means the person receiving your email generally won't know that you requested a delivery receipt.
A delivery receipt as a conversation between email servers rather than people. When you send the message, the recipient's email server accepts it, puts it in their inbox, and automatically sends you a signal back. The actual human recipient doesn't see a notification, and they don't have to click anything for that receipt to be sent to you.
This is different from a "Read Receipt," which does usually pop up and ask the person for permission to send a confirmation back to you.
For your reference, you can review this Microsoft support documentation: Add and request read receipts and delivery notifications in Outlook - Microsoft Support
A delivery receipt confirms delivery of your email message to the recipient's mailbox, but not that the recipient has seen it or read it.
I hope this information proves helpful.
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