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In classic Outlook, select File > Options.
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On the left side of the window, select the Mail tab.
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Scroll down to the Tracking section, then select Read receipt confirming the recipient viewed the message to turn on read receipts. Or clear the check box to turn them off.Â
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Select OK.
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In a message you are composing in new Outlook, on the Options tab, select or clear Request read receipt.
