To disable Outlook’s Tracking Receipts printing functionality, you can set the following Registry key.
Key: HKEY_CURRENT_USER\Software\Microsoft\Office\<version>\Outlook\Preferences
Value name: PrintTrackingPref
Value type: REG_DWORD
Value: 1
When the value is set to 1, Outlook won’t print tracking information. When the value is set to 0 or is missing, Outlook will print tracking information.