Group Policy : Outlook Spell check

I need a group policy that can be rolled out to enable "Check spelling before sending" to the entire domain.

I have checked the Goog's and everyone seems to say its not possible, however it is always attached to questions like "I want users to be able to switch it on and off and then not have it override"

We do not require this, just a plain force enable.

If its not possible via GPO, suggestions via CommandLine/Powershell/KaseayRMM scripting would be much appreciated.