curl --request GET \
  --url http://localhost:8000/api/v1/mail/messages/{message_id} \
  --header 'Authorization: Bearer <token>'

{
  "data": {
    "id": "<string>",
    "body": "<string>",
    "html_body": "<string>",
    "user_id": "<string>",
    "date": "<string>",
    "snippet": "<string>",
    "subject": "<string>",
    "thread_id": "<string>",
    "starred": true,
    "unread": true,
    "cc": [
      {
        "email": "<string>",
        "name": "<string>"
      }
    ],
    "bcc": [
      {
        "email": "<string>",
        "name": "<string>"
      }
    ],
    "from": [
      {
        "email": "<string>",
        "name": "<string>"
      }
    ],
    "reply_to": [
      {
        "email": "<string>",
        "name": "<string>"
      }
    ],
    "labels": [
      "<string>"
    ],
    "in_reply_to": "<string>"
  }
}