rewindex

CompaniesMailgunIncidents

Mailgun: US Email Ingest Errors

MinorStatus: resolvedStarted Resolved (-120 min)1 updatestspg.io (opens in new tab)

Timeline of updates

  1. resolved

    Between 12:55 UTC and 13:07 UTC, customers may have experienced email sending failures in the US region. A deployment of new code caused our sending pipeline to temporarily reject some email submissions with HTTP 500 or SMTP 451 errors (~ 2.5% of requests). Our team quickly identified the issue, rolled back the deployment, and restored normal service. Traffic was immediately shifted from the affected US region to the non impacted region to further mitigate customer impact while the rollback took place.

Archive proof

Rewindex commits each version of an incident it captures to a daily checkpoint, chains it to the day before, and has the checkpoint timestamped by FreeTSA and DigiCert. That proves this record existed by then and has not been changed since, by anyone, Rewindex included.

How the archive is checked, and what it cannot prove.

Impact, status and times are the vendor’s own, as last archived. View on stspg.io (opens in new tab).

Cite this

Status incident (vendor impact label: minor) posted by Mailgun, started 2025-10-08 15:00 UTC, resolved after -120 min, 1 update(s).

Title
US Email Ingest Errors
Vendor
Mailgun
Date
URL
https://rewindex.com/company/mailgun/incidents/lk05vdk90nb3

Mailgun profileRecent Mailgun incidentsAll outages on October 8, 2025Mailgun in October 2025MarkdownJSON