[
  {
    "event": "send",
    "msg": {
      "_id": "9a32184309ad4d5e9bfd20368d9d7981",
      "clicks": [],
      "email": "to@example.com",
      "opens": [],
      "sender": "from@example.com",
      "state": "sent",
      "subject": "[send] Sample Subject",
      "tags": [],
      "ts": 1350691301
    },
    "ts": 1350691301
  }
]