1. Log in to mail.protonmail.com and go to Settings → Organization → Multi-user support.
2. Click the Enable multi-user support button to create your first organization. You will then be prompted to pick a name for your organization. This name is for private internal use only, so it will not be seen outside your account.
3. Select your organization’s encryption key strength. This key will be used to encrypt all data in your organization user’s accounts (not your private user accounts), giving you access to the data while preventing ProtonMail from accessing it. Click Submit once you have made your choice.
4. Set a password for your organization. This is what protects your key from ProtonMail, so it is critical that you do not lose or forget this password. It is the only way you can access your organization in the future.
If you lose this password then you will not be able to modify your organization’s settings.
5. Activate your organization key. Simply re-enter the organization password you just created and click Submit. If you see a message saying that the key is already activated, simply click Close to continue.
6. Allocate storage space to your administrator account. The amount of storage space you have available is determined by your plan.
You can allocate your storage space among your organization users at a later point, but for now, you are allocating storage space only for the administrator account. This storage will be used for the administrator’s email contents and for files stored on Proton Drive. Click Submit when you are ready.
Your organization is now activated. You should now see its name when you go to Organization → Organization & Keys in either your ProtonMail settings or your ProtonMail account.
The next step is to add new users to your ProtonMail organization.
Below is a checklist of steps (plus related articles) for setting up an organization in ProtonMail.
Step 1: Set up Your custom domain(s)
Step 2: Create your organization (you are here)