---
title: "Send Message"
method: POST
path: "/mailbox/{mailbox_uid}/message/send"
---

# Send Message

`POST /mailbox/{mailbox_uid}/message/send`

## Request

- Base URL: `https://dc-region.zuperpro.com/api`
- URL: `https://dc-region.zuperpro.com/api/mailbox/{mailbox_uid}/message/send`
- Auth: API key in header `x-api-key`

Send a new email message.

## Path parameters

- `mailbox_uid` string, required

## Request body

- object
  - `to` object[], required
    - `name` string
    - `email` string, required
  - `cc` object[]
    - `name` string
    - `email` string
  - `bcc` object[]
    - `name` string
    - `email` string
  - `subject` string
  - `body` string: Plain text body
  - `body_html` string: HTML body
  - `reply_to_message_uid` string, nullable
  - `attachments` object[]
    - `filename` string
    - `attachment_uid` string: Obtained from /upload API
  - `custom_metadata` object: Key-value pairs for CRM or campaign tracking

## Response `200`

- object
  - `type` string
  - `message` string
  - `data` object
    - `message_id` string

## Changes

- **2026-11-03** `3c21bc232e16`: 1 info
  - endpoint added

[Operation history](https://skmtc.dev/zuper/apis/zuper-pro-api/changes/mailbox/:mailbox_uid/message/send/post.md)

---

[API](https://skmtc.dev/zuper/apis/zuper-pro-api.md) - [All operations](https://skmtc.dev/zuper/apis/zuper-pro-api/llms.txt) - [OpenAPI document](https://skmtc.dev/zuper/apis/zuper-pro-api/revisions/3c21bc232e16?raw)