# Courier: Major incident: Issue affecting sends

**Summary:** _summary pending_
- Kind: Major incident · Label: major (vendor)
- Changed: 2023-05-11 17:23 UTC · Detected: 2026-10-19 18:33 UTC
- [Source: https://stspg.io/k1sn1rpw4hmc](https://stspg.io/k1sn1rpw4hmc)
- [Company: Courier](https://rewindex.com/company/courier.md)
- Versions: before (none: first archived) → after incident\_version:730/8sl4rg8y7ypz@3140fe79cd85
- Change 1 of 1 for this incident

Incident page (full timeline): [Issue affecting sends](https://rewindex.com/company/courier/incidents/8sl4rg8y7ypz.md)
## What changed

**1. Added: Title**

```diff
+ Issue affecting sends
```

**2. Added: Impact**

```diff
+ major
```

**3. Added: Status**

```diff
+ resolved
```

**4. Added: Start time**

```diff
+ 2023-05-11 17:23 UTC
```

**5. Added: Resolved time**

```diff
+ 2023-05-11 20:04 UTC
```

**6. Added: Affected components**

```diff
+ API, Courier - API
```

**7. Added: Update** (investigating) · 2023-05-11 17:23 UTC

```diff
+ We are currently investigating an issue that appears to be affecting a percentage of messages being processed. In addition, customers may be receiving "NOT FOUND" errors for messages IDs that are affected when attempting to access them via logs or the API.
```

**8. Added: Update** (investigating) · 2023-05-11 19:08 UTC

```diff
+ We are continuing to investigate the issue. The team believes < that 8% of all messages to be impacted though further analysis is continuing. Out of an abundance of caution, the team has also ramped down rollout of any upgrades and features through our experimentation engine.
```

**9. Added: Update** (monitoring) · 2023-05-11 19:37 UTC

```diff
+ A fix has been deployed. The team is continuing to monitor. Any affected messages will automatically be reprocessed. The team will continue to monitor the health of the platform.
```

**10. Added: Update** (resolved) · 2023-05-11 20:04 UTC

```diff
+ The incident has been resolved
```

## History of this incident

| When (UTC) | Change | Label |
| --- | --- | --- |
| 2023-05-11 17:23 UTC | Major incident: Issue affecting sends (this change) | major |

All Courier changes: [timeline](https://rewindex.com/company/courier/changes.md)
_Diff excerpts are shown on normalized text: dates, counters and tokens appear as ‹date›, ‹count›, ‹tok›; noise-only edits are hidden. Rewindex shows the changed passages, not a copy of the page._


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Canonical: https://rewindex.com/change/i2e4eb11f3e7376 · Markdown: https://rewindex.com/change/i2e4eb11f3e7376.md · JSON: https://rewindex.com/api/v1/changes/i2e4eb11f3e7376 · Generated 2026-10-20T00:48:39.164Z