# Customer.io: Major incident: Customers are Unable to add new Email Sending Domains

> Major incident: Customers are Unable to add new Email Sending Domains. Detected 2026-11-07 by Rewindex: what changed on Customer.io’s status page, with the before/after diff.

Canonical: https://rewindex.com/change/i920304656aabf1
Last updated: 2026-11-07T00:04:04Z

**Summary:** _summary pending_
- Kind: Major incident · Label: outage (model (Jev))
- Changed: 2026-11-07 00:03 UTC · Detected: 2026-11-07 00:04 UTC
- [Source: https://status.customerio.com/incidents/18mtgfdc6n5b](https://status.customerio.com/incidents/18mtgfdc6n5b)
- [Company: Customer.io](https://rewindex.com/company/customer-io.md)
- Versions: before (none: first archived) → after incident\_version:241/18mtgfdc6n5b@8a772af8cd5f
- Change 1 of 2 for this incident

Incident page (full timeline): [Customers are Unable to add new Email Sending Domains](https://rewindex.com/company/customer-io/incidents/18mtgfdc6n5b.md)
## What changed

**1. Added: Title**

```diff
+ Customers are Unable to add new Email Sending Domains
```

**2. Added: Impact**

```diff
+ major
```

**3. Added: Status**

```diff
+ identified
```

**4. Added: Start time**

```diff
+ 2026-11-07 00:03 UTC
```

**5. Added: Affected components**

```diff
+ Management Interface
```

**6. Added: Update** (investigating) · 2026-11-06 23:53 UTC

```diff
+ We are currently investigating this issue.
```

**7. Added: Update** (identified) · 2026-11-07 00:03 UTC

```diff
+ We have identified the issue and are working to resolve the matter.
```

## History of this incident

| When (UTC) | Change | Label |
| --- | --- | --- |
| 2026-11-07 00:03 UTC | Major incident: Customers are Unable to add new Email Sending Domains (this change) | outage |
| 2026-11-07 00:34 UTC | [Incident updated: Customers are Unable to add new Email Sending Domains](https://rewindex.com/change/r323b11a74e9a0a.md) | Normal progress |

Next: [change](https://rewindex.com/change/r323b11a74e9a0a.md) · All Customer.io changes: [timeline](https://rewindex.com/company/customer-io/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._

## Cite this

Major incident: Customers are Unable to add new Email Sending Domains on Customer.io’s status page, changed 2026-11-07 00:03 UTC (change 1 of 2).

- Canonical URL: https://rewindex.com/change/i920304656aabf1
- Citation: Customer.io, “Major incident: Customers are Unable to add new Email Sending Domains” (2026-11-07 00:03 UTC). Archived by Rewindex: https://rewindex.com/change/i920304656aabf1 (CC BY 4.0).
- Markdown link: `[Customer.io: Major incident: Customers are Unable to add new Email Sending Domains (2026-11-07)](https://rewindex.com/change/i920304656aabf1)`


---
Canonical: https://rewindex.com/change/i920304656aabf1 · Markdown: https://rewindex.com/change/i920304656aabf1.md · JSON: https://rewindex.com/api/v1/changes/i920304656aabf1 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-11-07T16:29:19.085Z