Launch regedit on the BES and Navigate to HKEY_LOCAL_MACHINE\SOFTWARE\Research In Motion\BlackBerry Enterprise Server\Agents.
- Right-click the folder.
- Highlight New.
- Click DWORD Value.
- Type SuppressReadReceipts.
- Press Enter.
- Right-click the SuppressReadReceipts registry key.
- Click Modify.
- Select the Decimal option.
- Type 2 to prevent BlackBerry smartphone users from sending read receipt messages.
- Click OK.
- Restart the BlackBerry Controller.
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