Checks/Unchecks the option ''Attach a copy of the original notes as a OneNote file''.
| Registry Hive | HKEY_CURRENT_USER |
| Registry Path | software\policies\microsoft\office\16.0\onenote\options |
| Value Name | email attachment |
| Value Type | REG_DWORD |
| Enabled Value | 1 |
| Disabled Value | 0 |