necesito agregar uno datos a una cuenta gmail sin que viole sus reglas

var client = require('smtp-tls');
var client = new SMTPClient('smtp.gmail.com');
var credentials = {
  username: 'username',
  password: 'password'
};
client.on('connect', function(err, res) {
  client.login(credentials, function(err, res) {
    client.send('from@address', 'to@address', 'hello world!', function(err, res) {
      console.log('sent!');
    });
  });
});