I am working on a B2B multi-tenant application that will allow businesses to create an organization for its users. The users sign-up using their company email address. The organization is created at the same time as the first user from the company signs-up. I would like to use the domain name to look up organizations. I’m wondering how can I use Auth0 to restrict creation of organization only with business email addresses but not with email addresses from email providers (e.g. gmail.com, hey.com etc)? Is there a well known list of domain names that can be used to black-list?