Troubleshooting Rebound issues

Rebound is a free JavaScript snippet from Postmark that helps you notify users when their email address has delivery issues—like hard bounces or spam complaints—so they can update their information and continue receiving your emails.

Instead of silent delivery failures, Rebound displays a customizable banner or message on your website or app prompting users to fix their email address.

Learn more: https://postmarkapp.com/rebound

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How to check if Rebound is installed

You can confirm whether the Rebound snippet is active on your page using your browser’s developer tools:

1. Open your page in Chrome (or any modern browser).

2. Right-click anywhere and select Inspect.

3. Go to the Network tab.

4. Refresh the page.

5. Filter by XHR and look for a POST request to a Rebound endpoint.

If you see that request, the Rebound snippet is installed and running.

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If Rebound is installed but not displaying

If Rebound is loading but the banner isn’t showing when expected, here are a few things to check:

1. Verify your token

Rebound uses a token to securely connect to your Postmark account and check email delivery status.

• Make sure the token in your Rebound snippet matches the one from the correct Postmark account.

• Using a token from another account or server will prevent Rebound from working properly.

2. Make sure the user’s email is available

Rebound can only check an email address if it knows which user is logged in.

• Ensure your app passes the logged-in user’s email address to Rebound when rendering the snippet.

• Without a known email address, Rebound won’t be able to detect bounce or complaint events for that user.

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Helpful resources

• Rebound for Postmark: Overview
• Rebound JavaScript Snippet + Setup Guide