Postmark Server API
Postmark Server API liveness (api.postmarkapp.com): a tokenless GET to /server returns HTTP 401 when the transactional-email API is up, an auth-gated liveness probe with real uptime and latency.
Reachable, auth required
Last checked · response time 200 ms
90-day uptime
Past incidents
No incidents reported.
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- Guardian-measuredResolvedServer API: HTTP 403 · resolved after 5m
- Guardian-measuredResolvedServer API: HTTP 403 · resolved after 5m
- Guardian-measuredResolvedServer API: HTTP 403 · resolved after 5m
- Guardian-measuredResolvedServer API: HTTP 403 · resolved after 5m
- Guardian-measuredResolvedServer API: HTTP 403 · resolved after 5m
- Guardian-measuredResolvedServer API: HTTP 403 · resolved after 5m
- Guardian-measuredResolvedServer API: HTTP 403 · resolved after 5m
- Guardian-measuredResolvedServer API: HTTP 403 · resolved after 5m
- Guardian-measuredResolvedServer API: HTTP 403 · resolved after 5m
- Guardian-measuredResolvedServer API: HTTP 403 · resolved after 5m
Recent changes
No changes detected since monitoring began.
Integrate
The live status, 90-day uptime figure and change history on this page are also machine-readable: embed the badge, poll the JSON, or subscribe to the feed. No key needed.
Status badge: 
Markdown embed: [](https://guardiandev.ai/apis/postmark-api)
Machine-readable: JSON (versioned v1, CORS-enabled) · Atom feed of drift & outage events.
Guardian probes https://api.postmarkapp.com/server about every 5 minutes. How Guardian measures.