Whitelisting email domains is one way to add a layer of security for which players can access your whitelabel app. Any email addresses that are not in the whitelist will be prompted to instead register using an appropriate email domain.
Here's how to manage your whitelist:
1. Navigate to Admin Options > Modify Platform Configuration
2. Under REGISTRATION_WHITELIST_EMAILS, insert the email domains you wish to whitelist. Separate each email domain by a comma without spaces:
The example above means any user with an email address ending with @emaildomain1.com, @emaildomain2.com OR @emaildomain3.com (e.g. email@example.com) can register successfully for an account.
3. Click Update All to save the whitelist.