CORS for Mailgun Webhooks: Copy-Paste Reference
Mailgun webhooks and CORS get mixed up all the time, mostly because they solve different problems. Here’s the blunt version: Mailgun sending a webhook to your server does not need CORS Your browser calling your webhook endpoint does need CORS Your frontend should usually not call Mailgun directly That’s the whole mental model. If you keep those three rules straight, most confusion disappears. The short answer If Mailgun sends an event like delivered, opened, or failed to your backend: ...