---
title: "Changes to Create a mailbox"
method: POST
path: "/mailboxes"
---

# Changes to Create a mailbox

`POST /mailboxes`

> Every recorded change to this operation, newest first.

## Timeline

Changed in 2 of 7 revisions.

- **2026-09-30** `4dc1e20989c8`: 21 warning
- **2026-09-29** `ef5b22b98333`: 2 breaking, 8 info

## Changes

- **2026-09-30** `4dc1e20989c8`: 21 warning
  - added the new `daily_limit_exceeded` enum value to the `anyOf[#/components/schemas/Error]/code` response property for the response status `403`
  - added the new `daily_limit_exceeded` enum value to the `code` response property for the response status `400`
  - added the new `daily_limit_exceeded` enum value to the `code` response property for the response status `401`
  - added the new `daily_limit_exceeded` enum value to the `code` response property for the response status `402`
  - added the new `daily_limit_exceeded` enum value to the `code` response property for the response status `404`
  - added the new `daily_limit_exceeded` enum value to the `code` response property for the response status `409`
  - added the new `daily_limit_exceeded` enum value to the `code` response property for the response status `429`
  - added the new `monthly_limit_exceeded` enum value to the `anyOf[#/components/schemas/Error]/code` response property for the response status `403`
  - added the new `monthly_limit_exceeded` enum value to the `code` response property for the response status `400`
  - added the new `monthly_limit_exceeded` enum value to the `code` response property for the response status `401`
  - added the new `monthly_limit_exceeded` enum value to the `code` response property for the response status `402`
  - added the new `monthly_limit_exceeded` enum value to the `code` response property for the response status `404`
  - added the new `monthly_limit_exceeded` enum value to the `code` response property for the response status `409`
  - added the new `monthly_limit_exceeded` enum value to the `code` response property for the response status `429`
  - added the new `send_limit_exceeded` enum value to the `anyOf[#/components/schemas/Error]/code` response property for the response status `403`
  - added the new `send_limit_exceeded` enum value to the `code` response property for the response status `400`
  - added the new `send_limit_exceeded` enum value to the `code` response property for the response status `401`
  - added the new `send_limit_exceeded` enum value to the `code` response property for the response status `402`
  - added the new `send_limit_exceeded` enum value to the `code` response property for the response status `404`
  - added the new `send_limit_exceeded` enum value to the `code` response property for the response status `409`
  - added the new `send_limit_exceeded` enum value to the `code` response property for the response status `429`
- **2026-09-29** `ef5b22b98333`: 2 breaking, 8 info
  - added required request body
  - removed the success response with the status `200`
  - added the non-success response with the status `400`
  - added the non-success response with the status `401`
  - added the non-success response with the status `402`
  - added the non-success response with the status `403`
  - added the non-success response with the status `404`
  - added the non-success response with the status `409`
  - added the non-success response with the status `429`
  - added the success response with the status `201`

---

[Operation](https://skmtc.dev/poststack/apis/poststack-api/docs/mailboxes/post.md) - [API](https://skmtc.dev/poststack/apis/poststack-api.md) - [Page](https://skmtc.dev/poststack/apis/poststack-api/changes/mailboxes/post)