---
title: "Changes to Trigger a one-time send"
method: POST
path: "/v1/newsletters/{newsletter_id}/send"
---

# Changes to Trigger a one-time send

`POST /v1/newsletters/{newsletter_id}/send`

> Every recorded change to this operation, newest first.

## Timeline

Changed in 3 of 30 revisions.

- **2026-10-03** `f3a28f896929`: 1 breaking, 4 info
- **2026-09-21** `7aca33a41082`: 2 breaking, 3 warning, 3 info
- **2026-09-02** `5da2740beeb5`: 1 info

## Changes

- **2026-10-03** `f3a28f896929`: 1 breaking, 4 info
  - the response property `newsletter/sent_at` became nullable for the status `200`
  - added the optional property `newsletter/scheduled_at` to the response with the `200` status
  - added the optional property `newsletter/send_state` to the response with the `200` status
  - added the optional property `newsletter/timezone` to the response with the `200` status
  - added the optional property `newsletter/tz_match_enabled` to the response with the `200` status
- **2026-09-21** `7aca33a41082`: 2 breaking, 3 warning, 3 info
  - added `#/components/schemas/newsletterRateLimitOptions, subschema #2` to the request body `allOf` list
  - the request's body type changed from `object` to no type
  - removed the request property `rate_limit_email_rate`
  - removed the request property `rate_limit_spread`
  - removed the request property `rate_limit_time_period`
  - added the optional property `newsletter/expires_after` to the response with the `200` status
  - added the optional property `newsletter/recipient_file_error` to the response with the `200` status
  - added the optional property `newsletter/recipient_file_status` to the response with the `200` status
- **2026-09-02** `5da2740beeb5`: 1 info
  - added the media type `application/json` for the response with the status `429`

---

[Operation](https://skmtc.dev/customer/apis/customer-io-journeys-api-reference/docs/v1/newsletters/:newsletter_id/send/post.md) - [API](https://skmtc.dev/customer/apis/customer-io-journeys-api-reference.md) - [Page](https://skmtc.dev/customer/apis/customer-io-journeys-api-reference/changes/v1/newsletters/:newsletter_id/send/post)