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Mailgun: Elevated 401 errors in US Region

Impact: majorStatus: resolvedStarted Resolved (10 min)2 updatesSource: stspg.io (opens in new tab)
Summary

Mailgun reported a major incident affecting API and Email Services - API in the US region, where some requests incorrectly failed with 401 errors. It started at 2026-03-19 18:43 UTC and lasted 10 min, resolving at 2026-03-19 18:53 UTC after a fix was deployed and systems returned to normal.

Machine-written from the archived incident (Sol). Check the timeline before relying on it.

Affected components: APIEmail Services - API

Timeline of updates

  1. identified

    Some requests may be incorrectly failing with 401 error codes in our US region.

  2. resolved

    A fix has been deployed and systems are back to normal.

Rewindex changes for this incident

Impact, status and times are the vendor’s own, as last archived. View on stspg.io (opens in new tab). Mailgun profile · Recent Mailgun incidents · Markdown · JSON