Deliverability
Open and click tracking
4 min read
Tracking is off by default. Turn it on per domain under Domains, per campaign in the editor, or per email with track_opens / track_clicks in the API.
How it works
- Opens: a tiny invisible image is added to the HTML. When the mail app loads it, an open is counted.
- Clicks: links are routed through CARIO Mail, counted and redirected instantly to the original address. Unsubscribe links are never rewritten.
Webhooks
email.opened fires on the first open, email.clicked on the first click of each link.
Limits to know
- Apple Mail Privacy Protection and some security scanners load images automatically, so open rates can look high.
- Mail apps that block images do not report opens at all.
- Click data is more reliable than opens.
For receipts and password resets, leave tracking off: it adds nothing and keeps messages lean.