Allow all corporate users to email Helpdesk without creating a paid account

We want all users in our global company of ~5,000 users to create a JSM ticket via email, without creating a paid user account. We have setup the internal email and it does auto-create a JSM ticket, but only for those who have a paid JSM account.

I see the guidance around selecting Allow Customers to Create Accounts, but that doesn't tell me if these are paid seats. I don't want to open it up to 5000 paid seats but we do want to field requests from these people.

Can someone confirm if selecting Allow Customers... creates paid seats?