[
  {
    "host": "smtp1.example.com",
    "port": 587,
    "secure": "tls",
    "username": "user1@example.com",
    "password": "password1",
    "from_email": "user1@example.com",
    "from_name": "Sender One",
    "cooldown_seconds": 5
  },
  {
    "host": "smtp2.example.com",
    "port": 587,
    "secure": "tls",
    "username": "user2@example.com",
    "password": "password2",
    "from_email": "user2@example.com",
    "from_name": "Sender Two",
    "cooldown_seconds": 8
  },
  {
    "host": "smtp3.example.com",
    "port": 587,
    "secure": "tls",
    "username": "user3@example.com",
    "password": "password3",
    "from_email": "user3@example.com",
    "from_name": "Sender Three",
    "cooldown_seconds": 10
  },
  {
    "host": "smtp4.example.com",
    "port": 587,
    "secure": "tls",
    "username": "user4@example.com",
    "password": "password4",
    "from_email": "user4@example.com",
    "from_name": "Sender Four",
    "cooldown_seconds": 12
  },
  {
    "host": "smtp5.example.com",
    "port": 587,
    "secure": "tls",
    "username": "user5@example.com",
    "password": "password5",
    "from_email": "user5@example.com",
    "from_name": "Sender Five",
    "cooldown_seconds": 15
  }
]