ProtonMail Professional Accounts allow for the creation of sub-users for your organization. These sub-users can be either private or non-private.
By default, all users are non-private, which means that their emails can be read by any of the administrators of the organization. This might be desirable for employee oversight and compliance reasons. Non-private accounts are only accessible by administrators of your organization, it is not possible for ProtonMail to read the emails of ANY user of your organization, including also the non-private users.
During the user creation process, or afterwards through the Addresses/User tab within the settings, it is possible to set a new user as a private user. Private user’s messages are only accessible by that user and nobody else.
How to set a user as Private?
When creating a new user, select the Private Private button shown in the module:
For existing users, you can change them to a private user by selecting Make Private in the drop down next to the users information in the Addresses/Users Tab within the Settings.
It is important to note that changing a non-private account to private is a one way operation. It is NOT possible to make a private account non-private again. To do this, you would need to delete the account entirely and recreate it.
Below are some additional articles to assist you while setting up ProtonMail Business accounts:
Step 1: Setting up Your Domain(s)
Step 2: Creating your Organization
Step 3: Setting up User(s)
Step 4: Migration of existing email messages (Coming 2018)