curl --request GET \
  --url https://api.coldsend.pro/api/public/v1/sender-accounts/smtp/bulk/{job_id}/progress \
  --header 'X-API-Key: <api-key>'

{
  "success": true,
  "message": "<string>",
  "job": {
    "job_id": "<string>",
    "status": "<string>",
    "progress_percentage": 123,
    "total_rows": 123,
    "processed_count": 123,
    "success_count": 123,
    "failed_count": 123,
    "started_at": "<string>",
    "completed_at": "<string>",
    "results": []
  }
}