'use strict';

var nodemailer = require('nodemailer');
var smtp = require('nodemailer-smtp-transport');

var options = {
    service: 'gmail',
    auth: {
        user: 'username',
        pass: 'password'
    },
    logger: true,
    debug: true
};

var transport = nodemailer.createTransport(smtp(options));

var mailer = function (options) {
    return new Promise(function (resolve, reject) {
        transport.sendMail(options, function (error, response) {
            if (error) {
                reject(error);
            } else {
                resolve(response);
            }
        });
    });
};

mailer({
    from: 'sender@example.com',
    to: 'receiver@example.com',
    subject: 'test',
    text: 'hello world'
}).then(function (resp) {
    console.log(resp);
}).catch(function (err) {
    console.error(err);
});