Postmark Outage History
Postmark is up right nowPingoru has recorded 36 incidents for Postmark: 32 in the last 12 months and 9 in the last 90 days.
Show as a table
| Month | Incidents | Hours with an open incident |
|---|---|---|
| April 2026 | 3 | 18 of 720 (2%) |
| May 2026 | 2 | 30 of 744 (4%) |
| June 2026 | 3 | 65 of 720 (9%) |
| July 2026 | 1 | 6 of 744 (1%) |
| August 2026 | 3 | 52 of 744 (7%) |
| September 2026 | 4 | 6 of 720 (1%) |
| October 2026 | 1 | 2 of 744 (0%) |
| November 2026 | 1 | 4 of 103 (3%) |
Incidents, newest first
Major November 4, 2026 Delays processing Inbound messages 3h 32m Inbound
Started Nov 04, 2026, 01:30 PM UTC· resolved Nov 04, 2026, 05:02 PM UTC
- investigating Nov 04, 2026, 03:56 PM UTC
Investigating: some customers have reported that inbound messages have been delayed before reaching your webhook. Sending isn’t affected. We’re working on a fix and will update this post as soon as we know more. What you can do: Nothing for now. Your Inbound messages are still being received, and we’ll deliver them to your webhook as the delay clears.
- identified Nov 04, 2026, 04:37 PM UTC
We've identified the cause of the Inbound delay and put a fix in place, and we're monitoring while the delayed messages reach your webhook as the delay clears.
- resolved Nov 04, 2026, 05:02 PM UTC
Inbound processing is back to normal. The fix is holding, and all delayed messages have been delivered to your webhooks. We'll keep monitoring to make sure it stays that way.
Major October 27, 2026 SMS codes for two-factor authentication may not arrive 1h 43m Web App, Login
Started Oct 27, 2026, 05:19 PM UTC· resolved Oct 27, 2026, 07:02 PM UTC
- investigating Oct 27, 2026, 05:19 PM UTC
You may not receive the SMS code when you log in to your Postmark account. If this is happening, you might see “Unknown Error Occurred” or “There was a problem sending the security code to your phone number.” The issue is with our SMS delivery provider. Sending email through Postmark isn’t affected. We’re investigating and will update this page as soon as we know more. What you can do now: - If your account uses an authenticator app or a recovery code for two-factor authentication, use that to log in. - If you’re locked out and need access right away, contact support: https://postmarkapp.com/support
- resolved Oct 27, 2026, 07:02 PM UTC
Resolved We've identified and resolved the issue affecting SMS two-factor authentication codes. Codes should now arrive as expected when you log in to your Postmark account. Sending email through Postmark wasn't affected. If you still don't receive a code, please contact support: https://postmarkapp.com/support Resolved at 14:50 EDT (18:50 UTC) - 27 October 2026.
Major September 28, 2026 Delayed Inbound Message Processing 2h 5m Inbound
Started Sep 28, 2026, 03:55 PM UTC· resolved Sep 28, 2026, 06:00 PM UTC
- investigating Sep 28, 2026, 03:55 PM UTC
We are currently investigating reports of delayed inbound message delays as of 10:25 CDT. Messages are being queued and will be processed once the issue is resolved. No messages have been lost. We will provide an update as soon as we have more information.
- investigating Sep 28, 2026, 04:03 PM UTC
We've applied a fix and inbound message processing is now recovering. Delayed messages are being worked through, and processing times are returning to normal. No messages have been lost. We're continuing to monitor to confirm full recovery.
- resolved Sep 28, 2026, 06:00 PM UTC
This has been resolved. All inbound webhooks processing have been caught up. No messages have been lost.
Major September 28, 2026 Delayed Message Delivery 3h 58m API, General, Sending, SMTP and 2 more
Started Sep 28, 2026, 01:49 PM UTC· resolved Sep 28, 2026, 05:47 PM UTC
- investigating Sep 28, 2026, 03:22 PM UTC
We identified an issue that caused delays in outbound message sending between 9:49 AM and 10:07 AM CT. Messages were queued and are not lost. We are actively working on a mitigation and will provide an update as soon as we have more information.
- investigating Sep 28, 2026, 03:46 PM UTC
We've identified and resolved the underlying issue that caused the delay in outbound message sending between 9:49 AM and 10:07 AM CT. New messages since 10:07 AM CT are processing normally. We are now working through the backlog of messages queued during that window and will post a final update once all queued messages have been delivered. No messages were lost.
- resolved Sep 28, 2026, 05:47 PM UTC
This incident has been resolved. The backlog of messages queued during the delay between 9:49 AM and 10:07 AM CT (10:49–11:07 AM ET) has been fully processed and delivered. New messages continue to be accepted and delivered normally. No messages were lost. If you have questions about a specific message, please reach out to us at [email protected].
Major September 22, 2026 Delayed Message Delivery 20m API, Sending, SMTP, Sending
Started Sep 22, 2026, 06:15 PM UTC· resolved Sep 22, 2026, 06:35 PM UTC
- resolved Sep 24, 2026, 07:49 PM UTC
A subset of messages accepted between 2:15 pm and 2:35 pm EDT on September 22 (18:15 – 18:35 UTC) were held in queue due to a processing issue instead of being delivered immediately. Those messages were fully processed and delivered at 3:38 pm EDT on September 24 (19:38 UTC). No messages were lost. Messages accepted outside of this 20-minute window were not affected and were delivered normally. If you have questions about a specific message, please reach out to us at [email protected].
Major September 17, 2026 Web-App Page Loading Issues 1h 33m Web App, General
Started Sep 17, 2026, 08:12 PM UTC· resolved Sep 17, 2026, 09:45 PM UTC
- resolved Sep 17, 2026, 09:58 PM UTC
Some users were experiencing problems with our service from 4:15 pm to 5:25 pm EDT, resulting in a page titled "Something went wrong". We have identified the root of the issue and have applied a remediating solution. If you are still encountering this page after clearing your site data, cache & cookies, please reach out to us at [email protected].
Major August 24, 2026 Delays in Stats Data 3h 20m Analytics, Statistics
Started Aug 24, 2026, 05:44 PM UTC· resolved Aug 24, 2026, 09:05 PM UTC
- investigating Aug 24, 2026, 05:44 PM UTC
We're seeing delays of approximately 30 minutes in the data underlying the Stats API. This does not affect the Stats API endpoint itself, which is fully operational. Stats data is currently catching up and no data is being lost. We're monitoring closely and will update here as it resolves.
- resolved Aug 24, 2026, 09:05 PM UTC
We've now resolved the incident. Stats data has caught up and is now displaying in real time. This issue occurred from approximately 13:45 EDT to 16:25 EDT on August 24, 2026. Thank you for your patience.
Major August 18, 2026 Open Webhook Delays 1d 7h Webhooks
Started Aug 18, 2026, 02:34 PM UTC· resolved Aug 19, 2026, 10:12 PM UTC
- investigating Aug 19, 2026, 12:48 PM UTC
We are investigating an issue with open webhook delivery delays.
- identified Aug 19, 2026, 01:47 PM UTC
We've deployed a fix to resume delivering **new** open webhook events. The engineering team is actively working on redelivering previously backlogged events.
- identified Aug 19, 2026, 04:14 PM UTC
We are continuing to work on delivering past open webhook events. Thank you for your patience.
- investigating Aug 19, 2026, 06:43 PM UTC
Previously backlogged open webhook events are processing. We will update as we progress.
- monitoring Aug 19, 2026, 08:24 PM UTC
We are continuing to process previous events and it is expected to complete in the next 60-90 minutes.
- resolved Aug 19, 2026, 10:12 PM UTC
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).
Major August 14, 2026 Sending Delays 16h 50m API, Sending
Started Aug 14, 2026, 08:34 PM UTC· resolved Aug 15, 2026, 01:25 PM UTC
- investigating Aug 14, 2026, 08:34 PM UTC
We are investigating sending delay reports for some customers.
- investigating Aug 14, 2026, 08:43 PM UTC
A fix has been deployed. Messages were accepted successfully during this period and are now processing.
- monitoring Aug 14, 2026, 10:07 PM UTC
We are continuing to process backlogged messages. No data loss occurred. The incident occurred between approximately 2:43 – 3:34pm CT (19:43 – 20:34 UTC). A subset of messages sent via the API during this window will experience delays while the backlog clears. Engineering is actively working to accelerate processing.
- resolved Aug 15, 2026, 01:25 PM UTC
The issue has been resolved after additional monitoring into the early morning. Thank you for your patience.
Major July 6, 2026 Inbound Webhook Delays 6h 15m
Started Jul 06, 2026, 06:51 PM UTC· resolved Jul 07, 2026, 01:06 AM UTC
- investigating Jul 06, 2026, 07:51 PM UTC
We are investigating an issue causing webhook delays.
- investigating Jul 06, 2026, 10:04 PM UTC
We've identified the issue and deployed a fix. Previously delayed inbound webhooks are processing.
- resolved Jul 07, 2026, 01:06 AM UTC
We've now resolved the incident. Thanks for your patience.
Major June 11, 2026 Bounce Event Delays 1d 10h
Started Jun 11, 2026, 08:36 AM UTC· resolved Jun 12, 2026, 06:36 PM UTC
- investigating Jun 11, 2026, 09:25 PM UTC
We are investigating delays for bounce related Events, Webhooks, and Statistics.
- resolved Jun 11, 2026, 09:47 PM UTC
We've resolved the issue. Thank you for your patience.
- 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.
- investigating Jun 12, 2026, 04:08 PM UTC
Backlogged bounce related events are continuing to process.
- resolved Jun 12, 2026, 06:36 PM UTC
All 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 will continue to improve our systems.
Major June 4, 2026 Email Sending Delays 3h 46m
Started Jun 04, 2026, 08:50 PM UTC· resolved Jun 05, 2026, 12:36 AM UTC
- 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.
- investigating Jun 04, 2026, 11:39 PM UTC
A fix has been deployed and sending has resumed. We are processing the backlog of messages.
- 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.
Major June 1, 2026 Statistics Reporting Delays 1d 3h
Started Jun 01, 2026, 04:17 PM UTC· resolved Jun 02, 2026, 07:25 PM UTC
- investigating Jun 01, 2026, 04:17 PM UTC
We are investigating an issue causing delays in statistics reporting.
- investigating Jun 01, 2026, 11:54 PM UTC
Reporting delays are continuing to recover. We are continuing to monitor until resolution.
- 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.
- resolved Jun 02, 2026, 07:25 PM UTC
The issue has been resolved. Thank for your patience.
Major May 28, 2026 Inbound Reporting Delays 2h 59m
Started May 28, 2026, 05:21 PM UTC· resolved May 28, 2026, 08:21 PM UTC
- 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.
- 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.
- resolved May 28, 2026, 08:21 PM UTC
The issue has been resolved.
Major May 25, 2026 Webhook Delays 1d 3h
Started May 25, 2026, 02:25 PM UTC· resolved May 26, 2026, 05:45 PM UTC
- investigating May 26, 2026, 02:22 PM UTC
We are investigating an issue causing webhooks to be delayed.
- 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.
- resolved May 26, 2026, 05:45 PM UTC
The issue has been resolved.
Major April 21, 2026 SMTP Sending Delays in the European Union 1h 29m
Started Apr 21, 2026, 10:10 PM UTC· resolved Apr 21, 2026, 11:40 PM UTC
- 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.
- 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.
- 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.
Major April 8, 2026 Inbound & SMTP Delivery Delays (Network Connectivity Issues) 6h 3m
Started Apr 08, 2026, 08:50 PM UTC· resolved Apr 09, 2026, 02:53 AM UTC
- 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.
Major April 2, 2026 Sending Delays 10h 8m
Started Apr 02, 2026, 07:00 PM UTC· resolved Apr 03, 2026, 05:08 AM UTC
- 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.
Major March 27, 2026 Latency and Timeouts - Web App, API for Message Data 7h 59m
Started Mar 27, 2026, 07:37 PM UTC· resolved Mar 28, 2026, 03:36 AM UTC
- resolved Mar 28, 2026, 03:36 AM UTC
We've resolved the incident. Thanks for your patience.
Major March 26, 2026 Billing & Subscription Management Issues 11h 16m
Started Mar 26, 2026, 07:01 AM UTC· resolved Mar 26, 2026, 06:17 PM UTC
- resolved Mar 26, 2026, 06:17 PM UTC
The issue has been resolved.
Major March 25, 2026 Webhook Delays 2h 9m
Started Mar 25, 2026, 12:47 AM UTC· resolved Mar 25, 2026, 02:56 AM UTC
- resolved Mar 25, 2026, 02:56 AM UTC
The issue has been resolved! Thank you for patience.
Major March 8, 2026 Bounce Webhooks & Statistics Delays 1h 58m
Started Mar 08, 2026, 12:01 PM UTC· resolved Mar 08, 2026, 01:59 PM UTC
- resolved Mar 08, 2026, 01:59 PM UTC
Resolved! Thank you for your patience.
Major March 4, 2026 Sandbox Sending Issues 38m
Started Mar 04, 2026, 05:46 PM UTC· resolved Mar 04, 2026, 06:25 PM UTC
- resolved Mar 04, 2026, 06:25 PM UTC
We've now resolved the incident. Thanks for your patience.
Major February 26, 2026 Click Tracking Delays 1d 2h
Started Feb 26, 2026, 05:48 PM UTC· resolved Feb 27, 2026, 08:32 PM UTC
- 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.
Major February 23, 2026 Stats Delays 4h 33m
Started Feb 23, 2026, 05:44 PM UTC· resolved Feb 23, 2026, 10:17 PM UTC
- resolved Feb 23, 2026, 10:17 PM UTC
We've now resolved the incident. Thanks for your patience.