Courier Outage History

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Courier had 10 outages in the last 2 years totaling 10h 1m of downtime — averaging 0.4 incidents per month.

There were 10 Courier outages since July 7, 2025 totaling 10h 1m of downtime. Each is summarised below — incident details, duration, and resolution information.

Source: https://status.courier.com

Minor June 18, 2026

Send Pipeline Latency

Detected by Pingoru
Jun 18, 2026, 08:11 PM UTC
Resolved
Jun 18, 2026, 10:09 PM UTC
Duration
1h 57m
Affected: API
Timeline · 5 updates
  1. identified Jun 18, 2026, 08:11 PM UTC

    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

  2. identified Jun 18, 2026, 08:35 PM UTC

    The rollback deploy will land in about 30 minutes.

  3. identified Jun 18, 2026, 09:31 PM UTC

    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.

  4. monitoring Jun 18, 2026, 09:53 PM UTC

    Messages are being processed while our pipeline continues to process enqueued messages.

  5. resolved Jun 18, 2026, 10:09 PM UTC

    Send pipeline has resolved and enqueued messages are now sending properly.

Read the full incident report →

Minor May 27, 2026

Slack Deliverability Issues

Detected by Pingoru
May 27, 2026, 11:06 PM UTC
Resolved
May 27, 2026, 11:16 PM UTC
Duration
10m
Timeline · 2 updates
  1. monitoring May 27, 2026, 11:06 PM UTC

    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/

  2. resolved May 27, 2026, 11:16 PM UTC

    Please continue to monitor Slack's statuspage for any updates related to message deliverability: https://slack-status.com/

Read the full incident report →

Minor January 29, 2026

Observability Degradation

Detected by Pingoru
Jan 29, 2026, 11:13 PM UTC
Resolved
Jan 29, 2026, 10:00 AM UTC
Duration
—
Timeline · 1 update
  1. resolved Jan 29, 2026, 11:13 PM UTC

    The Courier team identified an issue affecting observability metrics between 21:38 UTC and 22:13 UTC, during which metrics briefly experienced an outage. A fix was released and metrics are stabilized through observability channels. Metrics received during the outage window will not be accounted for in observability dashboards.

Read the full incident report →

Minor January 14, 2026

Courier Web App Performance

Detected by Pingoru
Jan 14, 2026, 09:47 PM UTC
Resolved
Jan 15, 2026, 12:56 AM UTC
Duration
3h 9m
Affected: Web Application
Timeline · 2 updates
  1. identified Jan 14, 2026, 09:47 PM UTC

    The Courier team was alerted of a small degredation in the Courier web application. We have identified the issues and have rolled out a fix to mitigate. The current features will encounter some latency: - Audience Calculation - Audit Trail logging We will follow up with updates.

  2. resolved Jan 15, 2026, 12:56 AM UTC

    Fix is out and application is stable

Read the full incident report →

Critical October 20, 2025

All services impacted

Detected by Pingoru
Oct 20, 2025, 09:19 AM UTC
Resolved
Oct 20, 2025, 10:11 AM UTC
Duration
51m
Affected: Web ApplicationAPIAutomationsObservabilityCourier Inbox
Timeline · 4 updates
  1. identified Oct 20, 2025, 09:54 AM UTC

    An issue with our service provider, AWS, has impacted all Courier services. The engineering team is working on resolution.

  2. identified Oct 20, 2025, 09:55 AM UTC

    We are continuing to work on a fix for this issue.

  3. monitoring Oct 20, 2025, 10:02 AM UTC

    Service has been restored. Engineering is working through system review and will continue to monitor.

  4. resolved Oct 20, 2025, 10:11 AM UTC

    The incident has been resolved

Read the full incident report →

Minor October 17, 2025

Microsoft Teams Tenant Id Errors

Detected by Pingoru
Oct 17, 2025, 05:33 AM UTC
Resolved
Oct 17, 2025, 06:01 AM UTC
Duration
28m
Affected: API
Timeline · 2 updates
  1. monitoring Oct 17, 2025, 05:33 AM UTC

    The Courier team was alerted of an issue with MS Teams requests experiencing errors sending. We have identified the issue and published a fix that will land in production shortly

  2. resolved Oct 17, 2025, 06:01 AM UTC

    Release is in production and Microsoft Teams messages are passing successfully.

Read the full incident report →

Notice October 13, 2025

Mailgun Message Delivery Latency

Detected by Pingoru
Oct 13, 2025, 04:19 PM UTC
Resolved
Oct 13, 2025, 04:19 PM UTC
Duration
—
Timeline · 1 update
  1. resolved Oct 13, 2025, 04:19 PM UTC

    Courier experienced a slowdown in message delivery with Mailgun providers around 2AM PST. Our monitoring systems caught the spike in the bottleneck, which eventually stabilized. Our infrastructure team is actively monitoring.

Read the full incident report →

Notice October 8, 2025

Message Delivery Latency

Detected by Pingoru
Oct 08, 2025, 03:16 PM UTC
Resolved
Oct 08, 2025, 09:00 AM UTC
Duration
—
Timeline · 1 update
  1. resolved Oct 08, 2025, 03:16 PM UTC

    Courier's delivery platform experienced significant latency around 1am PST. Our platform team managed to resolve the issue and is actively monitoring for any potential issues.

Read the full incident report →

Minor July 7, 2025

Webapp HTTP Interaction Issues

Detected by Pingoru
Jul 07, 2025, 09:10 PM UTC
Resolved
Jul 07, 2025, 09:28 PM UTC
Duration
18m
Affected: Web Application
Timeline · 2 updates
  1. identified Jul 07, 2025, 09:10 PM UTC

    An issue with logging in to the Courier platform and overall app performance was identified by our team and a revert of the offending release has been deployed. The estimated time for the release to land is 45 minutes.

  2. resolved Jul 07, 2025, 09:28 PM UTC

    Revert has landed and webapp is operational.

Read the full incident report →