What Happens on Your Team
The Backend Developer
Searches the logs and finds the send calls failing with network timeouts. The code was written to never block a sign-up on email, so the error is logged and swallowed. That was the right design, and it's also why nobody noticed.
The real cost: Graceful error handling hides email outages by design. Users get a success message and no email, and the only signal is support volume rising, usually hours later.
What they should have had: A monitor on the Resend API root plus an alert to the team's chat. If the API stops answering, the team knows within one check interval, long before the support queue does.
The Support Lead
Sees five 'didn't get my reset email' tickets in an hour, when it's normally one a day. Escalates to engineering, who first suspect spam filters and spend half an hour on that.
The real cost: Missing email gets misdiagnosed as spam-folder trouble. While the team debugs deliverability, the real cause, an unreachable API, keeps failing every send.
What they should have had: A shared alert channel where monitor alerts land. One look shows whether the email API was failing, which settles 'spam filter or outage' in seconds.
The Founder
Notices sign-ups have flat-lined for the afternoon. Users are registering, but they can't confirm their email, so they never activate. The funnel looks broken and nobody knows why.
The real cost: When verification emails don't arrive, a sign-up becomes an abandoned account. Every hour of email outage is lost activations that rarely come back.
What they should have had: Monitoring on the email API and the sign-up flow, with response-time tracking. The moment either fails, there's an alert, and a timeline to compare against the dip in activations.
Why Monitor Resend?
When your email provider is unreachable, nothing on your site looks broken. Pages load, forms submit, and the emails your users are waiting for simply never arrive. Password resets, magic links and verification codes stall, and users assume your product is broken. Watching the Resend API and the routes in your app that send email is how you catch that silent failure.
What to Monitor
api.resend.comThe Resend API root, a lightweight reachability check that doesn't send anythingyour-app.com/api/healthAn app health route that confirms your email configuration is present and valid, without sending a real emailyour-app.com/forgot-passwordThe page behind your most important email flow, so the flow itself stays reachableWhat You Should Actually Do
- 1Monitor api.resend.com to know when the Resend API stops answering; it's a reachability check and doesn't send email
- 2Add an app health route that checks your email configuration (API key present, sending domain set) without sending a real message, and monitor it
- 3Monitor the pages behind your critical email flows: sign-up, forgot password, magic link
- 4Make sure your code logs failed send calls loudly; graceful handling is right, but silent handling hides outages
- 5Route alerts to a channel your support team can see, so 'missing email' tickets can be checked against real data
- 6Check resend-status.com during incidents, but remember it can't see your API key, sending domain or DNS records
Resend's Official Status Page
Resend publishes real-time status at resend-status.com. Monitoristic doesn't replace this — it complements it. The official page tells you when Resend reports an issue. Your own monitor tells you when your connection is affected, often before the status page updates. You also get push alerts instead of checking a webpage manually.
The Takeaway
Email outages are silent: the site works, the emails don't. Resend makes sending simple, but your app still needs a way to know when sends stop going out. A monitor on the API, plus your critical email pages, turns 'I never got the email' from a mystery into an alert.