# Substack: Major incident: Post emails delayed

**Summary:** Substack reported a major incident starting 2025-10-20 13:41 UTC, delaying scheduled post emails and partially disrupting publication dashboards, subscriber tabs and statistics. The vendor linked scheduled-post delays to a service-provider outage; manual publishing was a workaround. Scheduled sends recovered and the backlog cleared; the incident resolved at 2025-10-21 00:52 UTC after 11 h 11 min. _(machine-written, sol)_
- Kind: Major incident · Label: degradation (model (Jev))
- Changed: 2025-10-20 13:41 UTC · Detected: 2026-10-17 18:22 UTC
- [Source: https://stspg.io/bvpc229946p4](https://stspg.io/bvpc229946p4)
- [Company: Substack](https://rewindex.com/company/substack.md)
- Versions: before (none: first archived) → after incident\_version:261/tj9vz6w9v8qc@69921ba4ff6c
- Change 1 of 1 for this incident

## What changed

**1. Added: Title**

```diff
+ Post emails delayed
```

**2. Added: Impact**

```diff
+ major
```

**3. Added: Status**

```diff
+ resolved
```

**4. Added: Start time**

```diff
+ 2025-10-20 13:41 UTC
```

**5. Added: Resolved time**

```diff
+ 2025-10-21 00:52 UTC
```

**6. Added: Affected components**

```diff
+ Custom domains, Email delivery, Writer dashboards
```

**7. Added: Update** (investigating) · 2025-10-20 13:41 UTC

```diff
+ We are experiencing delays with processing scheduled posts related to an outage from one of our service providers. Our team is investigating.
```

**8. Added: Update** (investigating) · 2025-10-20 13:49 UTC

```diff
+ We are also seeing issues with publication dashboards including partial outages across the subscriber tab and some statistics. We are working to mitigate.
```

**9. Added: Update** (identified) · 2025-10-20 14:12 UTC

```diff
+ We are seeing recovery of our publisher dashboard functionality. Other service functions such as scheduled posts continue to be degraded.
```

**10. Added: Update** (identified) · 2025-10-20 16:51 UTC

```diff
+ We continue to experience delays with processing scheduled posts related to an outage from one of our service providers. Users can publish posts manually to bypass this. Our team is still investigating.
```

**11. Added: Update** (monitoring) · 2025-10-20 21:50 UTC

```diff
+ Scheduled post sends are operational and we have caught up with the backlog.
```

**12. Added: Update** (resolved) · 2025-10-21 00:52 UTC

```diff
+ This incident has been resolved.
```

## History of this incident

| When (UTC) | Change | Label |
| --- | --- | --- |
| 2025-10-20 13:41 UTC | Major incident: Post emails delayed (this change) | degradation |

All Substack changes: [timeline](https://rewindex.com/company/substack/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/i8f903847d4e3ac · Markdown: https://rewindex.com/change/i8f903847d4e3ac.md · JSON: https://rewindex.com/api/v1/changes/i8f903847d4e3ac · Generated 2026-10-18T00:38:55.774Z