Creating a Guest SSID Network on FortiAP/FortiGate with Captive Portal+Email Collection

https://www.youtube.com/watch?v=YXPtIDZZBP8&t=99s 

Businesses such as coffee shops provide free Internet access for customers. In this scenario, you do not need to configure guest management, as customers can access the WiFi access point without logon credentials. However, consider that the business wants to contact customers with promotional offers to encourage future patronage. You can configure an email collection portal to collect customer email addresses for this purpose.