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

# Send email

> Send or schedule an outbound email. Only send when requested. Reuse the same idempotency key and payload when retrying; use a new key for a new send.

Required permission: `emails:send`.



## OpenAPI

````yaml /openapi.json post /emails
openapi: 3.1.0
info:
  title: Moonemail API
  version: 0.1.0
  description: >-
    Generated request, response and authorization contract. Covers authenticated
    product endpoints, not public discovery, dashboard assets or Stripe inbound
    webhooks. Go handlers enforce state-dependent and cross-field business
    validation.
servers:
  - url: https://api.moonemail.co
security: []
paths:
  /emails:
    post:
      tags:
        - Emails
      summary: Send email
      description: >-
        Send or schedule an outbound email. Only send when requested. Reuse the
        same idempotency key and payload when retrying; use a new key for a new
        send.


        Required permission: `emails:send`.
      operationId: send_email
      parameters:
        - name: Idempotency-Key
          in: header
          required: false
          description: >-
            Optional in REST; mandatory for the MCP sending tool. Reuse the same
            key and payload for retries.
          schema:
            type: string
            minLength: 1
            maxLength: 256
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              properties:
                from:
                  type: string
                  minLength: 3
                  maxLength: 320
                to:
                  anyOf:
                    - type: string
                      minLength: 3
                      maxLength: 320
                    - type: array
                      items:
                        type: string
                        minLength: 3
                        maxLength: 320
                subject:
                  type: string
                  minLength: 1
                  maxLength: 998
                bcc:
                  anyOf:
                    - type: string
                      minLength: 3
                      maxLength: 320
                    - type: array
                      items:
                        type: string
                        minLength: 3
                        maxLength: 320
                cc:
                  anyOf:
                    - type: string
                      minLength: 3
                      maxLength: 320
                    - type: array
                      items:
                        type: string
                        minLength: 3
                        maxLength: 320
                reply_to:
                  anyOf:
                    - type: string
                      minLength: 3
                      maxLength: 320
                    - type: array
                      items:
                        type: string
                        minLength: 3
                        maxLength: 320
                html:
                  type: string
                  maxLength: 10485760
                text:
                  type: string
                  maxLength: 10485760
                headers:
                  type: object
                  additionalProperties:
                    type: string
                    maxLength: 998
                attachments:
                  type: array
                  items:
                    type: object
                    properties:
                      filename:
                        type: string
                        maxLength: 255
                      content:
                        type: string
                      path:
                        type: string
                        format: uri
                        pattern: ^https:\/\/
                      content_type:
                        type: string
                        maxLength: 255
                      content_id:
                        type: string
                        maxLength: 255
                    additionalProperties: false
                  maxItems: 50
                tags:
                  type: array
                  items:
                    type: object
                    properties:
                      name:
                        type: string
                        minLength: 1
                        maxLength: 256
                        pattern: ^[A-Za-z0-9_-]+$
                      value:
                        type: string
                        minLength: 1
                        maxLength: 256
                        pattern: ^[A-Za-z0-9_-]+$
                    required:
                      - name
                      - value
                    additionalProperties: false
                  maxItems: 50
                scheduled_at:
                  type: string
                  maxLength: 64
              required:
                - from
                - to
                - subject
              additionalProperties: false
      responses:
        '200':
          description: Success
          content:
            application/json:
              schema:
                type: object
                properties:
                  id:
                    type: string
                required:
                  - id
                additionalProperties: true
        default:
          description: API error
          content:
            application/json:
              schema:
                type: object
                required:
                  - statusCode
                  - name
                  - message
                properties:
                  statusCode:
                    type: integer
                  name:
                    type: string
                  message:
                    type: string
      security:
        - bearerKey: []
components:
  securitySchemes:
    bearerKey:
      type: http
      scheme: bearer
      description: Moonemail API key; x-required-scope applies.

````

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