# ActiveCampaign: Critical incident: Transactional Email Failures

**Summary:** ActiveCampaign reported a critical outage preventing transactional emails from sending, starting at 2026-09-28 15:05 UTC and resolved at 2026-09-28 18:55 UTC, lasting 3 h 50 min. Backlogged messages began sending at 15:16 UTC, and a fix was implemented at 15:22 UTC. _(machine-written, sol)_
- Kind: Major incident · Label: outage (model (Jev))
- Changed: 2026-09-28 15:05 UTC · Detected: 2026-10-17 18:22 UTC
- [Source: https://stspg.io/585zf902skjb](https://stspg.io/585zf902skjb)
- [Company: ActiveCampaign](https://rewindex.com/company/activecampaign.md)
- Versions: before (none: first archived) → after incident\_version:232/f5ztm4glsjwp@747f3059d1e0
- Change 1 of 1 for this incident

## What changed

**1. Added: Title**

```diff
+ Transactional Email Failures
```

**2. Added: Impact**

```diff
+ critical
```

**3. Added: Status**

```diff
+ resolved
```

**4. Added: Start time**

```diff
+ 2026-09-28 15:05 UTC
```

**5. Added: Resolved time**

```diff
+ 2026-09-28 18:55 UTC
```

**6. Added: Affected components**

```diff
+ Email, Message Sending Availability - Email
```

**7. Added: Update** (investigating) · 2026-09-28 15:05 UTC

```diff
+ Transactional email is currently failing to send. Engineering is investigating the root cause now and will report updates every 20 minutes.
```

**8. Added: Update** (identified) · 2026-09-28 15:16 UTC

```diff
+ The issue has been identified and the backlogged messages have started to send. Engineering is working to expedite the catch up.
```

**9. Added: Update** (monitoring) · 2026-09-28 15:22 UTC

```diff
+ A fix has been implemented and we are monitoring the results.
```

**10. Added: Update** (monitoring) · 2026-09-28 15:30 UTC

```diff
+ The backlogged messages are rapidly catching up. We expect full resolution within 20 minutes.
```

**11. Added: Update** (resolved) · 2026-09-28 18:55 UTC

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

## History of this incident

| When (UTC) | Change | Label |
| --- | --- | --- |
| 2026-09-28 15:05 UTC | Critical incident: Transactional Email Failures (this change) | outage |

All ActiveCampaign changes: [timeline](https://rewindex.com/company/activecampaign/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/iddf557e8612c5d · Markdown: https://rewindex.com/change/iddf557e8612c5d.md · JSON: https://rewindex.com/api/v1/changes/iddf557e8612c5d · Generated 2026-10-18T02:31:25.960Z