@TimWalsh upon testing this with my team more recently it appears:
- If you are a Super Admin, you’ll have access to all inboxes and be able to send emails from those addresses.
- All non-Super Admin users need to have explicit Access to the inbox to be able to send emails from those addresses - if they don’t have explicit Access, the address is greyed out for them/they can’t use it to send emails.
So I think the key here is:
- Limit how many Super Admins you have (if they don’t need god mode, give them a different permission set).
- Give Inbox Access very sparingly - only those who need to view and send emails from those addresses.
But I think we still need a setting to choose a ‘default’ send from address if there are multiple available.