The email address could come from one of 3 places:
- User Profile Service database
- the site collection's hidden User Information List
The reason I ask is that a client wants us to include FBA users in the email notification steps. The user will not have logged onto SharePoint (so won't be in the hidden list) and currently these users are not in the UPS database either.
Has anyone tried this? Does anyone know if Nintex is smart enough to query the right user store if the user is not an AD user?