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How It Works

When you send an email with HTML content, Sendi automatically:
  1. Open tracking — Injects an invisible 1x1 pixel image. When the recipient’s email client loads images, an “open” event is recorded.
  2. Click tracking — Rewrites links in your HTML to go through Sendi’s redirect service. When a link is clicked, a “click” event is recorded and the user is redirected to the original URL.

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Viewing Events

Open and click counts appear on each email in the Emails tab of the dashboard. You can also see them via the API: 
GET /api/emails/{id}
The response includes open_count, click_count, last_opened_at, and last_clicked_at fields.

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Webhooks

You can receive real-time notifications for opens and clicks by subscribing to these webhook events:
  • email.opened — Fired each time the tracking pixel is loaded
  • email.clicked — Fired each time a tracked link is clicked, includes the URL

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Accuracy

  • Opens rely on image loading, which some email clients block by default. Open rates are typically undercounted.
  • Clicks are accurate as long as the recipient clicks the link in the email.