Postmark experienced a major incident on September 28, 2026, lasting 3h 58m. The incident has been resolved; the full update timeline is below.
Update timeline
- 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].