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Mailgun Webhook Tester

Test Mailgun webhooks in real-time — no signup, no tunnels.

Get a free webhook URL in one click, paste it into your Mailgun dashboard, and watch events stream in live. Verify (in body: signature object) signatures automatically, replay any request to your local server, and debug payloads with search and filters.

Get a free Mailgun webhook URLFull Mailgun setup guide

Why test Mailgun webhooks with HookSense

Real-time WebSocket stream

Events appear the instant Mailgun sends them. No polling, no refresh button.

HMAC-SHA256 of timestamp+token (HTTP webhook signing key) verification

Paste your signing secret once — HookSense verifies every Mailgun request automatically.

One-click replay

Send any captured webhook back to your local server or production — rerun your handler without triggering new events.

CLI forwarding, no ngrok

Forward directly to localhost:3000 with npx hooksense listen.

Quick start — 3 steps

  1. 1
    Get your free webhook URL

    Create a free endpoint at hooksense.com. You get a unique URL instantly — no credit card, no config.

  2. 2
    Paste it into Mailgun

    In the Mailgun dashboard, add the URL as your webhook endpoint and pick the events you want (delivered, opened, etc.).

  3. 3
    Trigger an event and watch it arrive

    Fire a test event from Mailgun — it lands in HookSense within milliseconds. Inspect headers, body, and signature. Replay when ready.

Forward to localhost

npx hooksense listen -p 3000 --path /api/integrations/mailgun

Common Mailgun webhook events

delivered
opened
clicked
unsubscribed
complained
permanent_fail
temporary_fail
stored

Testing tips specific to Mailgun

  • Mailgun's signature lives in the body, not a header: HMAC-SHA256 of (timestamp + token) keyed by the HTTP webhook signing key
  • The signing key is separate from your API key — find it under Settings → Webhooks
  • Cache the token and reject duplicates to prevent replay attacks; loosely check the timestamp for freshness
  • Use HookSense Replay to retest delivery and bounce handling without sending real email

Test webhooks from other providers

Start testing Mailgun webhooks now

Free plan includes 100 requests/day, 7-day retention, real-time streaming. No credit card.

Create a free endpoint