rewindex

CompaniesPostmarkIncidents

Postmark: Open Webhook Delays

MinorStatus: resolvedStarted Resolved (32 h)1 updatestatus.postmarkapp.com (opens in new tab)

Timeline of updates

  1. resolved

    The issue is now fully resolved. We are continuing to improve our systems, observability, and monitoring to prevent future occurrences. Thank you for your patience.

    Starting August 18th at ~9:34am CT (~14:34 UTC), Postmark experienced delays in delivering open webhook events. New open events resumed delivery on August 19th at ~8:47am CT (~13:47 UTC), and all backlogged events completed re-delivery at ~4:52pm CT (~21:52 UTC).

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 status.postmarkapp.com (opens in new tab).

Cite this

Status incident (vendor impact label: minor) posted by Postmark, started 2026-08-18 14:34 UTC, resolved after 32 h, 1 update(s).

Title
Open Webhook Delays
Vendor
Postmark
Date
URL
https://rewindex.com/company/postmark/incidents/507337

Postmark profileRecent Postmark incidentsAll outages on August 18, 2026Postmark in August 2026MarkdownJSON