## Send an email

**post** `/v1/emails/send`

Sends an email via the connected email account that owns the `from` address. Currently supports new sends only; replies and forwards are not yet supported.

Supports idempotency via the `Idempotency-Key` header.

**[Required scope](/using-the-api/scopes/):** `emails:create`

**[Rate limit category](/using-the-api/rate-limits/):** Write

### Body Parameters

- `from: string`

  Bare email address (no display name). Must match a connected email account owned by the API key user. Compared case-insensitively. Used as the From header when sending.

- `messageBody: object { content, contentType }`

  Email message body (HTML or plain text).

  - `content: string`

    Email body content.

  - `contentType: optional "HTML" or "TEXT"`

    Defaults to `HTML`.

    - `"HTML"`

    - `"TEXT"`

- `subject: string`

  Email subject. Cannot be empty.

- `to: array of string`

  Recipient email addresses (bare, no display names). At least 1, at most 500.

- `attachments: optional array of string`

  Optional list of file IDs (uploaded via the Files API) to attach to the email. Maximum 5 attachments per email, each ≤ 3MB.

- `bcc: optional array of string`

  Bcc recipients (same shape as `to`).

- `cc: optional array of string`

  Cc recipients (same shape as `to`).

### Returns

- `EmailSendResponse object { sentAt }`

  - `sentAt: string`

    ISO 8601 timestamp of when the send completed.

### Example

```http
curl https://api.lightfield.app/v1/emails/send \
    -H 'Content-Type: application/json' \
    -H 'Lightfield-Version: 2026-03-01' \
    -H "Authorization: Bearer $API_KEY" \
    -d '{
          "from": "sales@acme.com",
          "messageBody": {
            "content": "<p>Hi there,</p><p>Following up on our chat earlier this week.</p>",
            "contentType": "HTML"
          },
          "subject": "Following up on our chat",
          "to": [
            "lead@example.com"
          ]
        }'
```

#### Response

```json
{
  "sentAt": "sentAt"
}
```