With the following configuration settings, users of a subscription can only communicate with other users of the same subscription or with contacts that were added in the management cockpit. The communication with external contacts is inhibited.
| Tab | Configuration Setting | Activated | Value | 
|---|---|---|---|
| Contacts | th_block_unknown | On | true | 
| Contacts | th_contact_sync | On | false | 
| Contacts | th_disable_add_contact | On | true | 
| Profile | th_readonly_profile | On | true | 
Hint: If you use Threema Broadcast, you can use this communication principle also for your Broadcast ID (“Availablility: Internal only”).