---
title: "Pull back a queued send"
method: POST
path: "/api/v1/rest/email/outbox/{id}/undo"
tags: ["Email & PEC"]
---

# Pull back a queued send

`POST /api/v1/rest/email/outbox/{id}/undo`

## Request

- Base URL: `https://api.custodo.ai`
- URL: `https://api.custodo.ai/api/v1/rest/email/outbox/{id}/undo`
- Auth: HTTP bearer

Recalls a message BEFORE it leaves — only while it is still `queued` inside the tenant’s own undo window. Once a message is `sending` or `sent` there is no protocol for un-sending it, and this refuses with EMAIL_SEND_ALREADY_STARTED. On success the row goes back to `draft`, unedited — call email_update_draft to fix it, then email_send again when ready.

**Examples**

- Wait, stop that email!
  `POST /api/v1/rest/email/outbox/55555555-6666-4777-8888-999999999999/undo`

## Path parameters

- `id` string, uuid, required

## Headers

- `X-Tenant-Id` string, uuid

## Response `200`

Done. `data` is the tool’s own answer.

- RestResult
  - `ok` true, required
  - `data` unknown, required

## Other responses

- `400`: The arguments did not validate: `error.message` names the field, what it expects and what arrived.
- `401`: No API key, or one that is malformed, unknown, revoked or expired.
- `403`: The call never ran: the module is off for this organisation, the credential lacks the permission or the module, the tier does not cover it, or the tool is destructive and the key was not minted for that.
- `404`: Nothing with that id in this organisation.
- `409`: The record is in a state that does not allow it — under legal hold, already sent, already closed. `error.code` says which.
- `422`: The tool ran and refused, in a sentence of its own (`TOOL_REFUSED`): the message says what to change. Retrying the same call will not help.
- `429`: The API key has spent its minute, or its day. Every request a key makes counts. See `Retry-After`.

---

[API](https://skmtc.dev/custodo/apis/custodo-integrazioni.md) · [All operations](https://skmtc.dev/custodo/apis/custodo-integrazioni/llms.txt) · [OpenAPI document](https://skmtc.dev/custodo/apis/custodo-integrazioni/revisions/16d336d3ec2a?raw)