Demonstrating HTTP 500 response from PostageApp

postageapp.js

/*
  Remember to fill in your API key.

  usage: node postageapp.js email@example.com
*/

var apiKey = 'FILL IN YOUR API KEY HERE',
    postageapp = require('postageapp')(apiKey),
    recipient = process.argv[2];

var payload = {
  recipients: recipient,
  content: {
    'text/plain': 'é'
  }
};

postageapp.sendMessage(payload, function (err, res) {
  if (err) {
    console.error(err);
    process.exit(1);
  }

  console.log(res);
  process.exit(0);
});