example

Subject: Thanks for signing up!
Date: {{date}}
To: {{recipient}}
From: {{sender}}
MIME-Version: 1.0
Content-Type: text/plain

Thanks for signing up for the Foobar service!

Your email address is: {{recipient}}

httpout.js

var outbound = require('./outbound');
var utils    = require('./utils');
var express  = require('express');
var expapp   = express.createServer();

exports.hook_init_master = function (next) {
    expapp.use(express.bodyParser());
    
    expapp.get('/', function (req, res) {
        res.send("Please use a valid URL");
    });
    var plugin = this;
    expapp.post('/SendMail/:template', function (req, res) {
        plugin.send_email(req, res);
    });

    expapp.listen(this.config.get('hdout.port') || 5000);

    next();
}

exports.send_email = function (req, res) {
    var self = this;
    this.loginfo("Sending email");

    if (!req.body.recipient) {
        res.send("No recipient", 400)
    }
    if (!req.body.sender) {
        res.send("No sender", 400)
    }

    // TODO: check format of recip/sender

    var template = this.config.get('mail_template/' + req.params.template, 'data');
    if (!template.length) {
        return res.send("Can't find that template", 404);
    }

    req.body.date = utils.ISODate(new Date());

    // we may want to replace this with handlebars.js in the future
    var output = template.join('\n').replace(/\{\{(\w+)\}\}/g, function (str, key) {
        // todo: will this break if the value is zero?
        return req.body[key] || '';
    });

    this.loginfo("Output: " + output);

    var outnext = function (code, msg) {
        switch (code) {
            case DENY:  self.logerror("Sending mail failed: " + msg);
                        res.send("Error sending email: " + msg, 500);
                        break;
            case OK:    self.loginfo("mail sent");
                        res.send({"result": "Success"});
                        break;
            default:    self.logerror("Unrecognised return code from sending email: " + msg);
                        res.send("Internal confusion error", 500);
        }
    };

    outbound.send_email(req.body.sender, req.body.recipient, output, outnext);
}

Awesome! Thanks for sharing