# Front: Major incident: [smtp] Problems with outbound sending on custom SMTP channels

**Summary:** Front reported a major outage affecting outbound sending on a subset of custom SMTP channels, listed as SMTP (non-Gmail / O365). It started at 2026-10-05 07:42 UTC and was resolved at 2026-10-05 09:45 UTC, lasting 2 h 2 min. Front deployed a fix but did not specify the cause. _(machine-written, sol)_
- Kind: Major incident · Label: outage (model (Jev))
- Changed: 2026-10-05 07:42 UTC · Detected: 2026-10-17 18:22 UTC
- [Source: https://stspg.io/sqplmrllzj6p](https://stspg.io/sqplmrllzj6p)
- [Company: Front](https://rewindex.com/company/front.md)
- Versions: before (none: first archived) → after incident\_version:328/0fxy345c37zw@c5eac17d97a1
- Change 1 of 1 for this incident

## What changed

**1. Added: Title**

```diff
+ [smtp] Problems with outbound sending on custom SMTP channels
```

**2. Added: Impact**

```diff
+ major
```

**3. Added: Status**

```diff
+ resolved
```

**4. Added: Start time**

```diff
+ 2026-10-05 07:42 UTC
```

**5. Added: Resolved time**

```diff
+ 2026-10-05 09:45 UTC
```

**6. Added: Affected components**

```diff
+ SMTP (non-Gmail / O365)
```

**7. Added: Update** (investigating) · 2026-10-05 07:42 UTC

```diff
+ We are investigating a spike in failures for outbound sending on a subset of custom SMTP channels.
```

**8. Added: Update** (identified) · 2026-10-05 08:34 UTC

```diff
+ We believe we have identified the cause and are deploying a fix.
```

**9. Added: Update** (monitoring) · 2026-10-05 09:13 UTC

```diff
+ The fix is deployed and the problem appears to be resolved. We are continuing to monitor.
```

**10. Added: Update** (resolved) · 2026-10-05 09:45 UTC

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

## History of this incident

| When (UTC) | Change | Label |
| --- | --- | --- |
| 2026-10-05 07:42 UTC | Major incident: \[smtp\] Problems with outbound sending on custom SMTP channels (this change) | outage |

All Front changes: [timeline](https://rewindex.com/company/front/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/i01b53925689589 · Markdown: https://rewindex.com/change/i01b53925689589.md · JSON: https://rewindex.com/api/v1/changes/i01b53925689589 · Generated 2026-10-18T02:31:51.863Z