redis-queued, underscore-templated, markdown-formatted, juice-styled e-mails in not that many lines of code.

package.json

{
  "name": "philip-j-fry",
  "version": "0.1.0",
  "author": "Jason Punyon <jason.punyon@gmail.com>",
  "description": "delivery boy",
  "contributors": [
    {
      "name": "Jason Punyon",
      "email": "jason.punyon@gmail.com"
    }
  ],
  "dependencies": {
    "redis": ">0.0.0",
    "nodemailer": ">0.0.0",
    "markdown": ">0.0.0",
    "underscore": ">0.0.0",
    "juice": ">0.0.0"
  },
  "private": true,
  "jshintConfig": {
    "node": true
  }
}

philip-j-fry.js

var redis = require('redis'),
    redis_client = redis.createClient(6379, 'localhost'),
    markdown = require('markdown').markdown,
    _ = require('underscore'),
    juice = require('juice');

_.templateSettings = {
  interpolate: /\{\{=(.+?)\}\}/g
};

//The templates
var templates = {
  en: {
    test: "**This is some markdown right here...** *Don't you love it?*\n#{{= name }}\nThis is from the templates object."
  },
  de: {
    test: "**Dies ist ein markdown direkt hier...**\n#{{= name }}"
  }
};

//The stylesheets
var stylesheets = {
  test: "h1 { color: red; }"
};

//The Mail.
var nodemailer = require('nodemailer');
var smtpTransport = nodemailer.createTransport("SMTP", {
  service: "Gmail",
  auth: {
    user: '<put in a user name here>',
    pass: '<put in a password here>'
  }
});

var sendMail = function(message) {
  smtpTransport.sendMail(message, function(error, response) {
    if (error) {
      console.log(error);
    } else {
      console.log("Message sent: " + response.message);
    }
  });
};

//The Mail pump.
var events = require('events'),
    mailMessageEmitter = new events.EventEmitter();

//Start listening to the redis queue.
var pumpMailMessage = function() {
  redis_client.blpop('mail-messages', 0, function(err, data) {
    mailMessageEmitter.emit('mail-message', data);
    pumpMailMessage();
  });
};

pumpMailMessage();

mailMessageEmitter.on('mail-message', function(data_json) {
  var data = JSON.parse(data_json[1]);
  var filledInTemplate = _.template(templates[data.language][data.template_name], JSON.parse(data.model));
  data.html = markdown.toHTML(filledInTemplate);

  data.html = juice.inlineContent(data.html, stylesheets[data.template_name]);
  data.text = data.filledInTemplate;
  sendMail(data);
});

console.log('Delivery boy Philip J. Fry, reporting for duty.');

pump-a-message.linq

void Main()
{
  var client = new BookSleeve.RedisConnection("localhost");
	client.Open();
	client.Lists.AddLast(0, "mail-messages", new {
		to = "recipient",
		@from = "sender",
		subject = "Who loves markdown?",
		template_name = "test",
		language = "de",
		model = new { name = "Bob Loblaw muhfuh." }.ToJson()
	}.ToJson());
	client.Close(false);
}