When Mailgun Goes Down: A Survival Guide for Your Team
Signups look healthy on the dashboard, but support tickets are trickling in: 'I never got my confirmation email.' 'My password reset link never arrived.' You check your app — no errors. You check Mailgun — and find a backlog of failed sends that started three hours ago when an API change quietly broke your integration. Every new user since then is stuck at the front door.
What Happens on Your Team
The Full-Stack Developer
Gets a ticket about a missing password reset. Tests it themselves — the email never arrives. Digs into the logs and finds the Mailgun API has been returning errors for hours. The app handled the failure 'gracefully' by not crashing — which is exactly why nobody noticed.
The real cost: Email failures are silent by design. A failed send rarely takes down the app, so it slips past every normal alarm. The cost is measured in locked-out users and abandoned signups that never showed up as errors.
What they should have had: A monitor on the Mailgun API host and a health endpoint that checks the email path. When sending breaks, the alert fires in minutes — not when the support queue fills up hours later.
The Customer Support Lead
Sees a spike in 'didn't receive email' tickets and assumes it's user error — spam folders, typos. Spends an hour telling people to check their junk mail before realizing the emails were never sent at all.
The real cost: Without a signal that email itself is broken, support treats a systemic outage as individual user problems. The wrong diagnosis wastes time and frustrates customers who are told to check a folder where nothing exists.
What they should have had: A status indicator tied to email-pipeline monitoring. The moment sending breaks, support knows it's a platform issue and can respond accurately instead of chasing spam-folder theories.
The SaaS Founder
Discovers days later that a chunk of trial signups never activated because the welcome and verification emails failed silently during a Mailgun incident. Those users churned before they ever started.
The real cost: Broken transactional email directly costs conversions. Users who can't verify their account or reset their password don't retry endlessly — they leave. The loss is invisible in the app and only shows up as unexplained drop-off.
What they should have had: Continuous monitoring of the email API path with recorded history. The founder can correlate a dip in activations with an email outage — and prevent the next one by catching it in minutes.
Why Monitor Mailgun?
Email is invisible until it stops. When Mailgun's API is unreachable or your sending breaks, password resets don't arrive, receipts go missing, and signup confirmations vanish — and there's no error page to warn you. By the time customers complain that they 'never got the email,' the failure has been running for hours. Monitoring the API endpoint your app calls closes that gap.
What to Monitor
api.mailgun.netMailgun's API host that your app sends throughyour-app.com/api/health/emailAn app endpoint that verifies the email pipeline is reachablestatus.mailgun.comMailgun's platform status for service-level incidentsWhat You Should Actually Do
- 1Monitor api.mailgun.net — the API host your app actually sends through
- 2Add a health endpoint in your app that verifies the email pipeline is reachable, and monitor it
- 3Set up alerts on an independent channel — don't rely on email to tell you email is down
- 4Watch for slow responses from the API — degraded send latency often precedes outright failures
- 5Bookmark Mailgun's status page for platform incidents, but trust your own monitor for integration-specific breaks
Mailgun's Official Status Page
Mailgun publishes real-time status at status.mailgun.com. Monitoristic doesn't replace this — it complements it. The official page tells you when Mailgun 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.
Transactional email fails quietly — no error page, no crash, just users who never get the message. By the time 'I didn't get the email' tickets arrive, the failure has been running for hours. You can't watch Mailgun's servers, but you can monitor the API host your app sends through and a health endpoint that exercises the email path. That turns a silent, hours-long outage into a 60-second alert.
Related Reading
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