This blog can help you to understand the default WHMCS Email settings when users create accounts.
| Notification Type | Users | Admin | 
| Email Verification | Yes | Bcc | 
| Welcome Email | Yes | Bcc | 
| Customer Invoice | Yes | Bcc | 
| New Order Notification | No | Yes | 
| Order confirmation | Yes | Bcc | 
| Payment confirmation | Yes | Bcc | 
| New Account Setup | Yes | Bcc | 
To buy WHMCS, Please click on WHMCS site

