{
  "enabled": "true|false",
  "host": "",
  "port": "[1-9][0-9]{0,3}|[1-5][0-9]{4}|[6][0-4][0-9]{3}|[6][5][0-4][0-9]{2}|[6][5][5][0-2][0-9]|[6][5][5][3][0-5]|^$",
  "sender": "",
  "use_ssl": "true|false",
  "use_sender": "true|false",
  "use_auth": "true|false",
  "username": "",
  "x_password": ""
}