curl --request POST \
  --url https://api.useanima.sh/v1/messages/email \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "agentId": "<string>",
  "to": [
    "jsmith@example.com"
  ],
  "subject": "<string>",
  "body": "<string>",
  "fromIdentityId": "<string>",
  "cc": [],
  "bcc": [],
  "bodyHtml": "<string>",
  "attachments": [
    {
      "filename": "<string>",
      "contentId": "<string>",
      "contentType": "<string>",
      "content": "<string>",
      "url": "<string>"
    }
  ],
  "headers": {},
  "metadata": {}
}
'

{
  "id": "<string>",
  "agentId": "<string>",
  "fromAddress": "<string>",
  "toAddress": "<string>",
  "subject": "<string>",
  "body": "<string>",
  "bodyHtml": "<string>",
  "headers": {},
  "metadata": {},
  "threadId": "<string>",
  "inReplyTo": "<string>",
  "externalId": "<string>",
  "sentAt": "2023-11-07T05:31:56Z",
  "receivedAt": "2023-11-07T05:31:56Z",
  "attachments": [
    {
      "id": "<string>",
      "filename": "<string>",
      "mimeType": "<string>",
      "sizeBytes": 1,
      "storageKey": "<string>",
      "url": "<string>",
      "createdAt": "2023-11-07T05:31:56Z",
      "detectedMimeType": "<string>"
    }
  ],
  "createdAt": "2023-11-07T05:31:56Z",
  "updatedAt": "2023-11-07T05:31:56Z"
}