curl --request POST \
  --url https://api.crevio.co/v1/email/inboxes/{inbox_id}/messages \
  --header 'Authorization: <api-key>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "to": "<string>",
  "subject": "<string>",
  "cc": "<string>",
  "bcc": "<string>",
  "text": "<string>",
  "html": "<string>",
  "reply_to": "<string>",
  "labels": [
    "<string>"
  ],
  "attachments": [
    {
      "content": "<string>",
      "filename": "<string>",
      "content_type": "<string>"
    }
  ]
}
'

{
  "object": "<string>",
  "id": "<string>",
  "thread_id": "<string>",
  "inbox_id": "<string>",
  "message_id": "<string>",
  "in_reply_to": "<string>",
  "references": [
    "<string>"
  ],
  "from": "<string>",
  "to": "<array>",
  "cc": "<array>",
  "bcc": "<array>",
  "reply_to": "<string>",
  "subject": "<string>",
  "preview": "<string>",
  "labels": [
    "<string>"
  ],
  "delivery": {},
  "attachments": "<array>",
  "text": "<string>",
  "html": "<string>",
  "timestamp": "<string>",
  "created_at": "2023-11-07T05:31:56Z"
}