If you're running into issues with async methods while working with Temp Mail APIs, you might want to consider switching to a service that provides a more developer-friendly experience and clean endpoints.

For example, 1SecMail offers a lightweight temp mail API that's super easy to integrate — no authentication required for basic use. It returns clean JSON responses and works well with async workflows (Node.js, Python, etc.).

Might save you some debugging time. Hope this helps!