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Connect Resend webhooks to Relin

Relin receives Resend webhooks, verifies signatures, stores payloads, and delivers them to your endpoints with retries, alerts, and replay.

Open the Resend dashboard

Before you start

  • Create a Relin workspace and sign in.
  • Have admin access to the Resend account where you'll configure the webhook.
  • Decide which events you want to capture, or start with "all events" if you're exploring.

Setup steps

  1. In Relin, open your workspace and click New source. Pick the Resend tile.
  2. Copy the ingest URL Relin shows. This URL is shown once, so store it.
  3. Open Webhooks in the Resend dashboard.
  4. Add an endpoint pointing at the Relin source URL.
  5. Paste the endpoint's signing secret here.
  6. Save and send a test event from Resend. Confirm Relin received it in your workspace.

Signing secret: Paste the webhook signing secret from Resend (starts with whsec_). Resend uses Svix, so verification follows the Standard Webhooks protocol.

What Relin does next

  • Verifies the signature on every incoming event and records the status (verified, failed, unchecked).
  • Stores the payload so you can replay or inspect it later, bounded by your workspace retention window.
  • Delivers the event to every destination you've connected to this source, with retries and per-destination rate limits.
  • Surfaces lifecycle gaps (for vendors with known lifecycles) as anomalies you can triage from the dashboard.

Test it

The fastest check is the events view in your workspace. After you send a test event from Resend, it appears within a second or two. Click into the event to see the raw payload, signature status, and the delivery attempts to your destinations.

You can also use the REST API or the MCP tools to inspect the stream programmatically.

Resend-specific notes

  • Resend uses Svix for delivery. Paste the whsec_ secret from the Resend webhooks page directly into the signing-secret field.

Troubleshooting

  • Signature status is failed: the signing secret doesn't match. Re-copy it from Resend and update the Relin source.
  • Signature status is unchecked: no signing secret is configured on the source yet. Paste the secret on the source settings page.
  • No events arriving: check that the ingest URL in Resend matches the URL Relin shows, including the token segment at the end.
  • Events arrive but destinations fail: open the delivery attempts tab on the event detail page. Each attempt shows the response body, status, and timing.

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