To request a read receipt or a delivery receipt for your message:
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Select at the top of the message compose pane.
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Select Show message options.
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Select Request a read receipt or Request a delivery receipt, or both.
To choose how Outlook on the web responds to read receipt requests:
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Select Settings > View all Outlook settings.
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Select Mail > Message handling.
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Under Read receipts, choose how to respond to requests for read receipts.