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When you receive a message with a read receipt request, that means the sender wants to get confirmation that you received the message. Read receipts can be automatically returned or not, or you can choose what to do for each read receipt request.
Click the File tab.
Click Options.
Click Mail.
Under Tracking, under For any message received that includes a read receipt request, click one of the following options:
Always send a response
Never send a response
Ask me before sending a response