Make to possible to use MTA in Sophos XG without Transparent Mode
Currently it's only possible to use the MTA in Transparent Mode.
It's not possible to choose to use it only as MTA without the Transparent Mode.
If the Automatic MTA Rule is disabled MTA isn't working anymore.
Please make it possible to choose between a Transparent and a not Transparent Mode of the MTA like it was in Sophos UTM.