curl --request GET \
  --url https://api.getoutbox.ai/email/campaigns/{campaign_id}/senders/ \
  --header 'Authorization: Bearer <token>'

{
  "results": [
    {
      "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "from_email": "jsmith@example.com",
      "from_name": "<string>",
      "status": "<string>"
    }
  ]
}