simplesmtp _onData bug

test.js

var smtp = require('simplesmtp')

var net = require('net')
var server = net.createServer(
  function (c) {
    console.log('connected')
    c.write('220 127.0.0.1\r\n')
    c.on('data',
      function (data) {
        console.log(data.toString())
        c.write('250-127.0.0.1\r\n250-8BITMIME\r\n')
        setTimeout(
          function () {
            c.write('250 OK\r\n')
          },
          10
        )
      }
    )
  }
)

server.listen(9999)

console.log('connecting')
var client = smtp.connect(9999, '127.0.0.1', { debug: true })

client.once('idle', function () {
  console.log('ok')
  process.exit(0)
})