Hi team，as we all know，
“CH>Organization Settings>External Communication>Allow selected domains only(with no allowed domains)”
it can control the messaging between internal users and external users,but only for the new space,it's not valid for spaces that have already existed.
The customer is concerned that this would compromise confidential information，because the spaces that have been started can't be controled to stop chatting with external users.
I think we need an update for it.
Thanks in advance!