Disables the custom fax cover sheet by displaying the message, "This option has been disabled by administrative policy" when the user clicks the Custom button in the Fax Service pane of the email message.
| Registry Hive | HKEY_CURRENT_USER |
| Registry Path | software\policies\microsoft\office\16.0\common\services\fax |
| Value Name | disallowcustomcoversheet |
| Value Type | REG_DWORD |
| Enabled Value | 1 |
| Disabled Value | 0 |