send mail with express and sendgrid

mail.js

/**package
 {
   "name": "mailson",
   "description": "Mailing for kids",
   "version": "0.1.0",
   "author": {
     "name": "Etay Perez",
     "email": "[email protected]"
   },
   "dependencies": {
      "nodemailer" : ""
   },
   "license": "MIT"
 }
 **/

var nodemailer = require('nodemailer'),
    mail,
    options;

var send = module.exports = function(req, res) {
    if (!mail) {
        console.error('please init() mail first');
        return res.send(500);
    }

    var message = {
        from: req.body.email,
        to: options.email,
        subject: options.subject + ' mail from ' + req.body.name,
        text: send.template(req.body)
    };

    mail.sendMail(message, function(err, response) {
        if (err)
            console.error('Error: Could not send mail.', response, err, message);
        else
            console.log('A mail was sent from', req.body.email);

        res.json(err ? 502 : 201, { success: !err });
    });
};

send.template = function(o) {
    return Object.keys(o).map(function(k) {
        return k + ': ' + o[k];
    }).join('\n');
};

send.init = function(sg, o) {
    if (!sg.user || !sg.key)
        return console.error('mail.js: where is sendgrid config?', sg);

    options = o;
    o.template && (send.template = o.template);
    mail = nodemailer.createTransport('SMTP', {
        service: "SendGrid",
        auth: {
            user: sg.user,
            pass: sg.key
        }
    });
};

/*
    Package.json:
        "mailson": "https://gist.github.com/eyy/6072677/raw/mail.js"
        
    Backend:
        var mail = require('mailson');
        mail.init(app.get('sendgrid'), {
            subject: app.get('site'),
            email: '[email protected]'
        });
        app.post('/mail', mail);

    Frontend:
        $('form#mail').submit(function(e) {
            e.preventDefault();
            var form = $(this);

            $('[type=submit]', form).prop('disable', true).attr('value', 'Sending...');

            $.post(form.attr('action'), form.serialize(), function(res) {
                form.hide();
                $('#sent').removeClass('hide');
            });
        });
*/