BlogMailgun Webhooks

How to Test Mailgun Webhooks

Mailgun webhooks report delivery and engagement events so you can monitor email deliverability, spam complaints, and subscriber actions.

Mailgun Official Webhook Docs

1. Mailgun Webhook Events

Mailgun can send the following webhook events to your endpoint:

delivered
opened
clicked
permanent_fail
temporary_fail
complained
unsubscribed

2. Set Up a Test Endpoint with HookRay

Follow these steps to start receiving Mailgun webhooks for testing:

  1. Go to HookRay and click "Start Testing — Free" to get your unique webhook URL.
  2. Copy the URL (e.g., https://h.hookray.com/abc123).
  3. In your Mailgun dashboard, navigate to the webhook settings and paste the HookRay URL as your endpoint.
  4. Select the events you want to receive (see list above).
  5. Trigger a test event — HookRay will show the incoming webhook in real-time.

3. Sample Mailgun Webhook Payload

Here's an example of what a Mailgun webhook payload looks like:

payload.json
{
  "signature": {
    "timestamp": "1763583600",
    "token": "77b1d2a3c4",
    "signature": "9ad98b88077c12af0abc12345def6789"
  },
  "event-data": {
    "event": "delivered",
    "timestamp": 1763583600,
    "recipient": "customer@example.com",
    "message": {
      "headers": {
        "subject": "Your order has shipped"
      }
    }
  }
}

4. Common Issues & Troubleshooting

Webhook not arriving?

Check that your endpoint URL is correct and publicly accessible. Mailgun cannot reach localhost URLs — use HookRay's cloud URL instead.

Getting 400 or 500 errors?

HookRay accepts any payload and returns 200 OK by default, so the issue is likely on Mailgun's side. Check your webhook configuration and event selection.

Need to verify webhook signatures?

Mailgun signs webhook requests for security. Use HookRay to capture the raw headers and body, then implement signature verification in your application code.

5. Next Steps

  • Use HookRay's webhook replay feature to re-send captured webhooks while building your handler
  • Enable smart parsing (Pro plan) to see Mailgun-specific fields highlighted automatically
  • Check the Mailgun webhook documentation for the complete event reference

Ready to test Mailgun webhooks?

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