This JSON shows how the same fields could be submitted in a future integration. No Mailflow endpoint is implemented here.

{
  "from": {
    "name": "Example Sender",
    "email": "hello@example.com"
  },
  "to": [
    "recipient@example.com"
  ],
  "subject": "Example subject",
  "html": "<p>Example HTML content</p>",
  "text": "Example plain-text content"
}