# Send batch of different emails

Send up to 500 completely different emails in a single API call.

Batch sending where each email can have:
- Different recipient
- Different subject
- Different content
- Different settings

Perfect for sending multiple transactional emails at once (order confirmations, password resets, etc.).

Limits:
- Maximum 500 emails per batch
- Each email validated independently
- Failed emails don't affect successful ones

Use cases:
- Sending different transactional emails simultaneously
- Mixed email types in one API call
- High-volume transactional sending

Not for: Newsletter-style emails with same content → Use /api/bulk-send instead

Endpoint: POST /api/batch
Version: 1.0.0
Security: ApiKeyAuth

## Request fields (application/json):

  - `customer_id` (string, required)
    Your customer ID
    Example: "550e8400-e29b-41d4-a716-446655440000"

  - `emails` (array, required)
    Array of emails to send (max 500)

  - `emails.to` (string, required)
    Recipient email address
    Example: "user@example.com"

  - `emails.from` (string)
    From email (must use verified domain, optional)
    Example: "hello@mail.yourdomain.com"

  - `emails.domain` (string)
    Sending domain (optional - auto-selects if omitted)
    Example: "mail.yourdomain.com"

  - `emails.reply_to` (string)
    Reply-to address
    Example: "support@yourdomain.com"

  - `emails.cc` (array)
    CC recipients

  - `emails.bcc` (array)
    BCC recipients

  - `emails.subject` (string, required)
    Email subject
    Example: "Your order has shipped"

  - `emails.html` (string)
    HTML email body
    Example: "<h1>Order shipped!</h1>"

  - `emails.text` (string)
    Plain text body
    Example: "Your order has shipped"

  - `emails.track_opens` (boolean)
    Enable open tracking

  - `emails.track_clicks` (boolean)
    Enable click tracking

  - `emails.headers` (object)
    Custom headers

  - `emails.tag` (string)
    Tag for organizing

  - `emails.metadata` (object)
    Custom metadata

## Response 200 fields (application/json):

  - `total` (integer)
    Total emails in batch

  - `queued` (integer)
    Successfully queued emails

  - `failed` (integer)
    Failed emails

  - `results` (array)
    Successfully queued emails

  - `results.index` (integer)
    Index in original array

  - `results.to` (string)
    Recipient

  - `results.email_id` (string)
    Email ID for tracking

  - `results.message_id` (string)
    Message-ID header

  - `results.status` (string)
    Enum: "queued"

  - `errors` (array)
    Failed emails (only if any failed)

  - `errors.email` (string)
    Email address or identifier

  - `errors.error` (string)
    Error message

## Response 400 fields (application/json):

  - `error` (string)

  - `message` (string)

## Response 403 fields (application/json):

  - `error` (string)

  - `message` (string)

  - `reason` (string)

## Response 404 fields (application/json):

  - `error` (string)

  - `message` (string)

## Response 500 fields (application/json):

  - `error` (string)

  - `message` (string)