Postmark Outage History

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Postmark had 25 outages in the last 2 years totaling 1650h 40m of downtime — averaging 1 incident per month.

There were 25 Postmark outages since September 9, 2025 totaling 1650h 40m of downtime. Each is summarised below — incident details, duration, and resolution information.

Source: https://status.postmarkapp.com

Major June 11, 2026

Bounce Event Delays

Detected by Pingoru
Jun 11, 2026, 09:25 PM UTC
Resolved
Jun 13, 2026, 08:53 PM UTC
Duration
1d 23h
Timeline · 4 updates
  1. investigating Jun 11, 2026, 09:25 PM UTC

    We are investigating delays for bounce related Events, Webhooks, and Statistics.

  2. resolved Jun 11, 2026, 09:47 PM UTC

    We've resolved the issue. Thank you for your patience.

  3. investigating Jun 12, 2026, 03:30 PM UTC

    Additional bounce related event delays have been identified. We are deploying a fix to release the backlogged events.

  4. investigating Jun 12, 2026, 04:08 PM UTC

    Backlogged bounce related events are continuing to process.

Read the full incident report →

Major June 4, 2026

Email Sending Delays

Detected by Pingoru
Jun 04, 2026, 08:50 PM UTC
Resolved
Jun 05, 2026, 12:36 AM UTC
Duration
3h 46m
Timeline · 3 updates
  1. investigating Jun 04, 2026, 10:39 PM UTC

    We are experiencing email sending delays due to degraded system performance. Mail is still being accepted into the system.

  2. investigating Jun 04, 2026, 11:39 PM UTC

    A fix has been deployed and sending has resumed. We are processing the backlog of messages.

  3. resolved Jun 05, 2026, 12:36 AM UTC

    The 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. Engineering will continue to monitor.

Read the full incident report →

Major June 1, 2026

Statistics Reporting Delays

Detected by Pingoru
Jun 01, 2026, 04:17 PM UTC
Resolved
Jun 02, 2026, 07:25 PM UTC
Duration
1d 3h
Timeline · 4 updates
  1. investigating Jun 01, 2026, 04:17 PM UTC

    We are investigating an issue causing delays in statistics reporting.

  2. investigating Jun 01, 2026, 11:54 PM UTC

    Reporting delays are continuing to recover. We are continuing to monitor until resolution.

  3. investigating Jun 02, 2026, 05:36 PM UTC

    We are experiencing statistics reporting delays. Engineering is monitoring the backlogged queues as they continue to process.

  4. resolved Jun 02, 2026, 07:25 PM UTC

    The issue has been resolved. Thank for your patience.

Read the full incident report →

Major May 28, 2026

Inbound Reporting Delays

Detected by Pingoru
May 28, 2026, 05:21 PM UTC
Resolved
May 28, 2026, 08:21 PM UTC
Duration
2h 59m
Timeline · 3 updates
  1. investigating May 28, 2026, 05:21 PM UTC

    We are currently investigating an issue causing a delay in reporting for some inbound email activity. Mail delivery is unaffected.

  2. investigating May 28, 2026, 05:47 PM UTC

    A fix has been deployed and inbound reporting performance has returned to normal. We are continuing to monitor.

  3. resolved May 28, 2026, 08:21 PM UTC

    The issue has been resolved.

Read the full incident report →

Major May 25, 2026

Webhook Delays

Detected by Pingoru
May 25, 2026, 02:25 PM UTC
Resolved
May 26, 2026, 05:45 PM UTC
Duration
1d 3h
Timeline · 3 updates
  1. investigating May 26, 2026, 02:22 PM UTC

    We are investigating an issue causing webhooks to be delayed.

  2. investigating May 26, 2026, 02:59 PM UTC

    A fix has been deployed and webhooks have returned to their expected performance. Engineering is continuing to monitor.

  3. resolved May 26, 2026, 05:45 PM UTC

    The issue has been resolved.

Read the full incident report →

Major April 21, 2026

SMTP Sending Delays in the European Union

Detected by Pingoru
Apr 21, 2026, 10:10 PM UTC
Resolved
Apr 21, 2026, 11:40 PM UTC
Duration
1h 29m
Timeline · 3 updates
  1. investigating Apr 21, 2026, 10:10 PM UTC

    Some customers sending from the European Union are experiencing delays in outbound message delivery. Affected messages may appear in a "Processing" state. We are actively investigating the issue and will provide an update shortly.

  2. investigating Apr 21, 2026, 11:30 PM UTC

    The issue has been identified and a fix has been deployed. Previously delayed messages are now sending. We will continue to monitor until the backlog has fully cleared.

  3. resolved Apr 21, 2026, 11:40 PM UTC

    Good 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 through this.

Read the full incident report →

Major April 8, 2026

Inbound & SMTP Delivery Delays (Network Connectivity Issues)

Detected by Pingoru
Apr 08, 2026, 08:50 PM UTC
Resolved
Apr 09, 2026, 02:53 AM UTC
Duration
6h 3m
Timeline · 1 update
  1. resolved Apr 10, 2026, 05:15 PM UTC

    **[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: https://www.google.com/appsstatus/dashboard/incidents/224ozRqzW4sFBDK8hLnT We will share an additional update regarding our internal action items later today.

Read the full incident report →

Major April 2, 2026

Sending Delays

Detected by Pingoru
Apr 02, 2026, 07:00 PM UTC
Resolved
Apr 03, 2026, 05:08 AM UTC
Duration
10h 8m
Timeline · 1 update
  1. resolved Apr 09, 2026, 10:31 PM UTC

    **[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 infrastructure configuration change that disrupted internal mail routing. While messages were safely queued in a "Processing" state, they were not delivered until the routing configuration was restored. Service was restored on **April 3rd at ~4:20am UTC** and the backlog of queued messages began sending immediately. **No data was lost during this event.** We have since implemented additional monitoring on our internal routing and surrounding sending services to ensure our teams are alerted to processing bottlenecks immediately. We sincerely apologize for the delay and will continue to improve.

Read the full incident report →

Major March 4, 2026

Sandbox Sending Issues

Detected by Pingoru
Mar 04, 2026, 05:46 PM UTC
Resolved
Mar 04, 2026, 06:25 PM UTC
Duration
38m
Timeline · 1 update
  1. resolved Mar 04, 2026, 06:25 PM UTC

    We've now resolved the incident. Thanks for your patience.

Read the full incident report →

Major February 26, 2026

Click Tracking Delays

Detected by Pingoru
Feb 26, 2026, 05:48 PM UTC
Resolved
Feb 27, 2026, 08:32 PM UTC
Duration
1d 2h
Timeline · 1 update
  1. resolved Feb 27, 2026, 08:32 PM UTC

    The 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 for your patience.

Read the full incident report →

Major February 23, 2026

Stats Delays

Detected by Pingoru
Feb 23, 2026, 05:44 PM UTC
Resolved
Feb 23, 2026, 10:17 PM UTC
Duration
4h 33m
Timeline · 1 update
  1. resolved Feb 23, 2026, 10:17 PM UTC

    We've now resolved the incident. Thanks for your patience.

Read the full incident report →

Major February 11, 2026

Webhook Delivery Delays

Detected by Pingoru
Feb 11, 2026, 11:30 PM UTC
Resolved
Feb 12, 2026, 03:30 PM UTC
Duration
16h
Timeline · 1 update
  1. resolved Feb 12, 2026, 03:30 PM UTC

    We've resolved the issue. Thanks for your patience.

Read the full incident report →

Major February 1, 2026

Postmark UI Unavailable

Detected by Pingoru
Feb 01, 2026, 01:30 PM UTC
Resolved
Feb 02, 2026, 04:37 PM UTC
Duration
1d 3h
Timeline · 1 update
  1. resolved Feb 02, 2026, 04:37 PM UTC

    The 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 have identified the issue and remediated it. We are also working on improvements to our alerting to ensure a more timely update to our customers. We do not anticipate further issues.

Read the full incident report →

Major December 19, 2025

Inbound Email Delays

Detected by Pingoru
Dec 19, 2025, 10:08 PM UTC
Resolved
Dec 19, 2025, 11:04 PM UTC
Duration
56m
Timeline · 1 update
  1. resolved Dec 19, 2025, 11:17 PM UTC

    Starting 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 improvements to prevent recurrence.

Read the full incident report →

Major December 1, 2025

Intermittent Statistics Delays

Detected by Pingoru
Dec 01, 2025, 08:32 PM UTC
Resolved
Dec 03, 2025, 06:21 PM UTC
Duration
1d 21h
Timeline · 1 update
  1. resolved Dec 03, 2025, 06:21 PM UTC

    We've resolved the issue after additional monitoring. Thank you for your patience.

Read the full incident report →

Major October 20, 2025

Upstream Cloud Provider Outage

Detected by Pingoru
Oct 20, 2025, 06:17 AM UTC
Resolved
Oct 21, 2025, 04:30 AM UTC
Duration
22h 13m
Timeline · 1 update
  1. resolved Oct 21, 2025, 04:30 AM UTC

    The upstream cloud provider resolved the outage at approximately 653pm EDT. After additional monitoring, we are resolving this issue.

Read the full incident report →

Major October 18, 2025

Intermittent Web Application Availability

Detected by Pingoru
Oct 18, 2025, 02:46 AM UTC
Resolved
Oct 18, 2025, 04:21 AM UTC
Duration
1h 35m
Timeline · 1 update
  1. resolved Oct 23, 2025, 02:52 AM UTC

    Starting 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 this period. The web application returned to normal at approximately 12:21am EDT on October 18th.

Read the full incident report →

Major September 9, 2025

API Latency and Timeout Errors

Detected by Pingoru
Sep 09, 2025, 02:30 AM UTC
Resolved
Oct 23, 2025, 02:40 AM UTC
Duration
44d
Timeline · 1 update
  1. resolved Oct 23, 2025, 02:40 AM UTC

    Engineering has implemented additional performance improvements to enhance system reliability and speed. All systems continue to operate normally.

Read the full incident report →