nodemailer-full

var smtpTransport = nodemailer.createTransport({
    service: 'service',
    auth: {
        user: 'username',
        pass: 'password'
    }
});

var mailOptions = {
    from: 'from@email.com',
    to: 'to@email.com',
    subject: 'Email subject',
    text: 'This is the main email body'
};

smtpTransport.sendMail(mailOptions, function (error, response) {
    if (error) {
        console.log('Error sending email' + error);
    } else {
        console.log('Email sent!';
    }
    smtpTransport.close();
});