curl --request POST \
  --url https://email.universal.rollout.com/api/emailMessages \
  --header 'Content-Type: application/json' \
  --data '
{
  "subject": "<string>",
  "body": "<string>",
  "sender": {
    "name": "<string>",
    "email": "<string>"
  },
  "recipients": [
    {
      "name": "<string>",
      "email": "<string>"
    }
  ],
  "personId": "<string>",
  "userId": "<string>",
  "threadId": "<string>"
}
'

{
  "id": "<string>",
  "personId": "<string>",
  "userId": "<string>",
  "threadId": "<string>",
  "subject": "<string>",
  "body": "<string>",
  "sender": {
    "name": "<string>",
    "email": "<string>"
  },
  "recipients": [
    {
      "name": "<string>",
      "email": "<string>"
    }
  ],
  "isRead": true,
  "isStarred": true,
  "isIncoming": true,
  "sent": "<string>",
  "received": "<string>",
  "created": "<string>",
  "updated": "<string>",
  "rolloutUpdated": "<string>",
  "originalIds": {},
  "original": {}
}