You won’t find a physical /email folder inside the api directory — and that’s completely expected.
The API is built using a router-based system (like many modern frameworks), which means URLs like /api/email are virtual routes, not actual folders. When you make a request to /api/email, the request is routed internally by the app (usually via an index.php file) to the appropriate function or controller that handles email sending.
So even though the folder structure doesn’t show an email subdirectory, the logic for handling /email is still there, just behind the scenes.