How to handle read receipts
Outlook Sync has a unique feature of a customized read receipts. You can modify what Outlook is going to send.
To enable Outlook Sync read receipt handling:
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                                                Turn off Outlook’s own handling. Go to the Options -> Mail and under Tracking section select Never send a read receipt.   Figure. Outlook Read Receipt handling settings. 
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                                                Go to Outlook Sync’s settings -> Appearance tab and check Handle read receipts checkbox. From now on, Outlook Sync will handle all incoming read receipt requests. 
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                                                In the same window, click Edit to edit the receipt request.   Figure. Read Receipt editor.