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Courier Outage History

Daily provider-status observations and published incident history for Courier.

Operational

Courier is operational. Verified . Official provider source.

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89.5% of 57 verified observed days had no reported provider issue

90-Day Trend

Jul 23Oct 20

Dashed calendar markers below identify legacy observations whose source-at-observation was not recorded.

Monthly Status Summary

Month Issue-free days Days Tracked Days with issues
September 2026 86.7% 30 4

This percentage summarizes normalized provider-status observations by calendar day. It is not duration-based, component-weighted, or contractual uptime. See the methodology and limitations.

Recorded Daily Status (Last 91 Days)

Jul 22 Today
Legacy observation Operational Degraded Partial Outage Major Outage Maintenance No Data

Incident History

October 2026
Queued Messages
minor Observed active window 19m

View incident details and source

Started:

API
monitoring
Messages are flowing again. We will continue to monitor.
identified
We found the issue. We believe it's an issue with our cloud provider. Fix is being rolled out.
investigating
Messages are being queued resulting in delayed sends.
Delayed Messages
minor Observed active window 39m

View incident details and source

Started:

API
monitoring
All queued messages have been processed. We will continue to monitor.
monitoring
The fix as been deployed and the queued messages are beginning to be processed again
identified
Issue has been identified and are working to roll out a fix. All messages that have been queued up will be sent.
investigating
We are currently investigating an issue with delayed messages.

Legacy Incident Archive

2 archived records restored. These records predate source-at-observation attestation. They are shown as historical ServiceAlert records only and do not establish a provider-reported incident, resolution, duration, or current active state.

June 2026
Send Pipeline Latency
minor Source not attested
Last archived state: resolved
View archived record details
monitoring
Messages are being processed while our pipeline continues to process enqueued messages.
identified
The team has identified that the most recent deployment was not the cause of the regression. The team is still working on identifying the root cause. Messages will not be dropped, and they will be processed once the fix is out.
identified
The rollback deploy will land in about 30 minutes.
identified
The team has identified a regression causing send requests to be stuck in a queued state. We have initiated a rollback to quickly resolve the issue. More updates to follow
May 2026
Slack Deliverability Issues
minor Source not attested
Last archived state: resolved
View archived record details
monitoring
Slack has reported messaging, and app degredation on their platform that could be impacting deliverability of Slack messages. This is a downstream provider issue and can be monitored on Slack's statuspage: https://slack-status.com/
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