Postmark Outage History

44 incidents recorded over the last 365 days, 43 of them resolved, 1 still open. Durations are measured from when PulsAPI first saw the problem to when it cleared, which is usually longer than the vendor's own figure.

Live Postmark status98.86% uptime history

Every Recorded Postmark Incident

Postmark incidents, newest first, with date, duration and status.
DateIncidentDurationStatus
Aug 19, 2026Open Webhook DelaysThe 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)…9h 23mResolved
Aug 18, 2026Webhook MaintenanceThe maintenance is now complete. Thanks for your patience.7 minResolved
Aug 14, 2026Sending DelaysThe issue has been resolved after additional monitoring into the early morning. Thank you for your patience.16h 50mResolved
Aug 6, 2026Infrastructure MaintenanceThe maintenance is now complete. Thanks for your patience.23h 56mResolved
Jul 24, 2026Infrastructure MaintenanceThe scheduled maintenance is now underway. We'll keep you updated on our progress.78h 17mResolved
Jul 20, 2026Infrastructure MaintenanceWe will be rescheduling the planned maintenance. Another status with the updated schedule will be posted.—Investigating
Jul 6, 2026Inbound Webhook DelaysWe've now resolved the incident. Thanks for your patience.5h 15mResolved
Jun 11, 2026Bounce Event DelaysAll previously backlogged events have been processed. The issue occurred starting on June 11th at approximately 3:36am to June 12th 1:01pm CT (June 11th 08:36 – June 12th 18:01 UTC). Thank you for your patience. We…21h 11mResolved
Jun 4, 2026Email Sending DelaysThe backlog of messages have been sent and system performance has returned to its expected state. Sending delays occurred between 4:50 – 6:35pm CT (21:50 – 23:35 UTC) for both transactional and broadcast mail…1h 57mResolved
Jun 1, 2026Statistics Reporting DelaysThe issue has been resolved. Thank for your patience.27h 7mResolved
May 28, 2026Inbound Reporting DelaysThe issue has been resolved.2h 59mResolved
May 26, 2026Webhook DelaysThe issue has been resolved.5h 22mResolved
Apr 21, 2026SMTP Sending Delays in the European UnionGood news - this issue has been resolved and everything should be working normally now. We're continuing to monitor closely to make sure everything stays stable. Thank you so much for your patience while we worked…1h 29mResolved
Apr 8, 2026Inbound & SMTP Delivery Delays (Network Connectivity Issues)**[UPDATE]** We determined that yesterday's network instability was caused by a widespread Google (Gmail) outage. You can find more information on Google’s Status Dashboard here…6h 3mResolved
Apr 2, 2026Sending Delays**[UPDATE]** On **April 2nd** starting at **~07:00pm UTC**, Postmark experienced an incident that resulted in delayed message delivery and webhook notifications for some customers. The issue was caused by an…10h 8mResolved
Mar 27, 2026Latency and Timeouts - Web App, API for Message DataWe've resolved the incident. Thanks for your patience.7h 59mResolved
Mar 26, 2026Billing & Subscription Management IssuesThe issue has been resolved.11h 16mResolved
Mar 25, 2026Webhook DelaysThe issue has been resolved! Thank you for patience.2h 9mResolved
Mar 8, 2026Bounce Webhooks & Statistics DelaysResolved! Thank you for your patience.1h 58mResolved
Mar 4, 2026Sandbox Sending IssuesWe've now resolved the incident. Thanks for your patience.38 minResolved
Feb 26, 2026Click Tracking DelaysThe incident has been resolved. Engineering will continue to monitor through the weekend. Long term system improvements and mitigation processes will continue to be a high priority effort. We appreciate and thank you…26h 43mResolved
Feb 23, 2026Stats DelaysWe've now resolved the incident. Thanks for your patience.4h 33mResolved
Feb 11, 2026Webhook Delivery DelaysWe've resolved the issue. Thanks for your patience.16h 0mResolved
Feb 1, 2026Postmark UI UnavailableThe Postmark UI availability was restored February 1st at approximately ~8am EST. We experienced an infrastructure issue that caused the UI to be unavailable for an extended period. This did not impact sending. We…27h 7mResolved
Jan 26, 2026Intermittent Inbound Email DelaysWe've now resolved the incident. Thanks for your patience.3h 18mResolved
Jan 9, 2026Postmark Website MaintenanceThe maintenance is now complete. Thanks for your patience.1h 0mResolved
Dec 19, 2025Inbound Email DelaysStarting at approximately 5:08pm until 6:04pm EST, some customers experienced additional inbound message delivery delays. Previously backlogged requests have been sent. The engineering team is investigating scaling…56 minResolved
Dec 18, 2025Inbound Email DelaysWe've now resolved the incident. Thanks for your patience.2h 36mResolved
Dec 7, 2025Possible delays in inbound processingWe've now resolved the incident. Thanks for your patience.275h 33mResolved
Dec 1, 2025Intermittent Statistics DelaysWe've resolved the issue after additional monitoring. Thank you for your patience.45h 49mResolved
Nov 26, 2025System MaintenanceThe maintenance is now complete. Thanks for your patience.2h 59mResolved
Nov 26, 2025System MaintenanceThe maintenance is now complete. Thanks for your patience.43 minResolved
Oct 23, 2025System MaintenanceThe maintenance is now complete. Thanks for your patience.1h 0mResolved
Oct 20, 2025Upstream Cloud Provider OutageThe upstream cloud provider resolved the outage at approximately 653pm EDT. After additional monitoring, we are resolving this issue.22h 13mResolved
Oct 18, 2025Intermittent Web Application AvailabilityStarting at approximately 9:46pm EDT on October 17th, the web application was intermittently unavailable or experienced slow response times for some customers. Postmark systems including sending were not affected during…1h 35mResolved
Oct 9, 2025Partial Service Outage (Sending Not Affected)This issue has been resolved.21h 55mResolved
Sep 19, 2025[Scheduled] Database MaintenanceThe maintenance is now complete. Thanks for your patience.1h 20mResolved
Sep 18, 2025[Scheduled] Planned MaintenanceThe maintenance is now complete. Thanks for your patience.1h 0mResolved
Sep 10, 2025SMTP Authentication IssuesWe've now resolved the incident. Thanks for your patience.25h 40mResolved
Sep 9, 2025API Latency and Timeout ErrorsEngineering has implemented additional performance improvements to enhance system reliability and speed. All systems continue to operate normally.1056h 10mResolved
Sep 6, 2025SMTP Connection IssuesOn September 6, 2025 from approximately 11am-230pm EST, we experienced SMTP connections issues during planned database maintenance which resulted in intermittent sending issues for some customers using SMTP. The issue…3h 30mResolved
Sep 5, 2025Intermittent Inbound Email DelaysThe issue has been resolved. We will continue to monitor inbound performance ongoing.493h 31mResolved
Sep 5, 2025Broadcast Sending DelaysWe've now resolved the incident. Thanks for your patience.10h 20mResolved
Aug 29, 2025Microsoft Deliverability Issues (Outlook, Hotmail)We've resolved the issue and will continue to improve our systems, deliverability, and communications going forward.431h 4mResolved

How to Read This Postmark Incident Log

Each row is an incident PulsAPI observed, not a summary written afterwards. The duration is wall-clock time between the first failing check and the first clean one, so it includes the window before Postmark acknowledged anything. Vendor post-mortems typically measure from acknowledgement, which is why their numbers are usually shorter.

Incidents still open have no duration yet and are listed as ongoing rather than being given a running total. The archive covers the last 365 days; anything older has aged out of the window rather than never having happened.

The longest single Postmark outage in this window ran 44d, against a mean recovery of 2d 15h. If you depend on Postmark in a customer-facing path, the longest figure is the one to design around. The mean is what happens on a normal bad day; the maximum is what happens on the worst one.