Creating an email in Blackbaud NetCommunity, you will need to select a specific data source to send you emails to. You want to send an email to a User Import and want to know what data source is needed for your email template.
After the User Import completes, a list will automatically be created. The data source of this list is Registered Users. The data source of your template should be Registered Users or None, depending on whether or not you want to include merge fields.