Zendesk incident
Outbound email delivery failures to some mail providers
Resolved after 6 hours 40 minutes, affecting Email and Support, on September 21, 2026.
We have observed recovery and are now seeing successful outbound email delivery to the affected email providers. Please let us know if you continue to see any 554 status coded rejections to these recipients. Unfortunately we are unable to resend these emails on your behalf, and we apologize for that inconvenience.
Affected components
Update timeline
- resolved Sep 21, 2026, 02:09 PM UTC
We are aware of an issue impacting outbound email delivery to some mail providers. Some outbound email may fail with an error code 554 -- permanent rejection, meaning the outbound email was not sent and will not be retried. We are working with these mail providers and will provide an update as soon as possible.
- resolved Sep 21, 2026, 02:50 PM UTC
We have observed recovery and are now seeing successful outbound email delivery to the affected email providers. Please let us know if you continue to see any 554 status coded rejections to these recipients. Unfortunately we are unable to resend these emails on your behalf, and we apologize for that inconvenience.
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