> ## Documentation Index
> Fetch the complete documentation index at: https://docs.coldsend.pro/llms.txt
> Use this file to discover all available pages before exploring further.

# Add ColdSend native inbox

> **Create a ColdSend managed email inbox**

Create a new email inbox on ColdSend's managed infrastructure. ColdSend handles
all infrastructure, deliverability, and reply monitoring.

## Prerequisites

- Domain must be verified and active in your workspace
- Domain must have available inbox capacity

## Features

- Full inbox management by ColdSend
- Automatic reply monitoring via Stalwart
- Azure Communication Services for reliable sending
- Daily sending limits configurable per inbox
- Health score tracking and alerts



## OpenAPI

````yaml /public_openapi.json post /api/public/v1/sender-accounts/coldsend-native
openapi: 3.0.3
info:
  title: ColdSend Public API
  description: >-
    Programmatic access to ColdSend for managing cold email campaigns and sender
    accounts.
  version: 1.0.0
  contact:
    name: ColdSend Support
    email: support@coldsend.pro
    url: https://coldsend.pro
servers:
  - url: https://api.coldsend.pro
    description: Production
security:
  - ApiKeyAuth: []
paths:
  /api/public/v1/sender-accounts/coldsend-native:
    post:
      tags:
        - Sender Accounts
      summary: Add ColdSend native inbox
      description: >-
        **Create a ColdSend managed email inbox**


        Create a new email inbox on ColdSend's managed infrastructure. ColdSend
        handles

        all infrastructure, deliverability, and reply monitoring.


        ## Prerequisites


        - Domain must be verified and active in your workspace

        - Domain must have available inbox capacity


        ## Features


        - Full inbox management by ColdSend

        - Automatic reply monitoring via Stalwart

        - Azure Communication Services for reliable sending

        - Daily sending limits configurable per inbox

        - Health score tracking and alerts
      operationId: create_coldsend_inbox_api_public_v1_sender_accounts_coldsend_native_post
      requestBody:
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/ColdSendInboxCreateRequest'
        required: true
      responses:
        '201':
          description: ColdSend inbox created successfully
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ColdSendInboxCreateResponse'
        '400':
          description: Invalid request data
        '401':
          description: Missing or invalid API key
        '403':
          description: Insufficient permissions - requires 'sender_accounts:write' scope
        '404':
          description: Domain not found
        '409':
          description: Email already exists or domain at capacity
        '422':
          description: Validation Error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/HTTPValidationError'
components:
  schemas:
    ColdSendInboxCreateRequest:
      properties:
        domain_id:
          type: string
          format: uuid
          title: Domain Id
          description: >-
            Domain ID where the inbox will be created. The domain must be
            verified and active in your workspace.
        email_prefix:
          type: string
          maxLength: 64
          minLength: 1
          title: Email Prefix
          description: Email prefix (part before @, e.g., 'support', 'john', 'outreach')
        display_name:
          type: string
          maxLength: 255
          minLength: 1
          title: Display Name
          description: >-
            Display name shown in recipient's inbox (e.g., 'John Smith from
            Company')
      type: object
      required:
        - domain_id
        - email_prefix
        - display_name
      title: ColdSendInboxCreateRequest
      description: >-
        Request to create a ColdSend native inbox.


        ColdSend native inboxes are created on domains managed by ColdSend
        infrastructure.

        They use Azure Communication Services for sending and Stalwart for
        receiving.
    ColdSendInboxCreateResponse:
      properties:
        success:
          type: boolean
          title: Success
        message:
          type: string
          title: Message
        inbox_id:
          type: string
          format: uuid
          title: Inbox Id
          description: Created inbox ID
        email_address:
          type: string
          title: Email Address
          description: Full email address
        display_name:
          type: string
          title: Display Name
          description: Display name
        domain_id:
          type: string
          format: uuid
          title: Domain Id
          description: Domain ID
        domain_name:
          type: string
          title: Domain Name
          description: Domain name
        overall_status:
          type: string
          title: Overall Status
          description: Inbox status
        created_at:
          type: string
          format: date-time
          title: Created At
          description: Creation timestamp
      type: object
      required:
        - success
        - message
        - inbox_id
        - email_address
        - display_name
        - domain_id
        - domain_name
        - overall_status
        - created_at
      title: ColdSendInboxCreateResponse
      description: Response for ColdSend inbox creation.
    HTTPValidationError:
      properties:
        detail:
          items:
            $ref: '#/components/schemas/ValidationError'
          type: array
          title: Detail
      type: object
      title: HTTPValidationError
    ValidationError:
      properties:
        loc:
          items:
            anyOf:
              - type: string
              - type: integer
          type: array
          title: Location
        msg:
          type: string
          title: Message
        type:
          type: string
          title: Error Type
      type: object
      required:
        - loc
        - msg
        - type
      title: ValidationError
  securitySchemes:
    ApiKeyAuth:
      type: apiKey
      in: header
      name: X-API-Key
      description: API key with format cs_live_xxx

````