var transporter = nodemailer.createTransport('smtps://user%40gmail.com:pass@smtp.gmail.com');

// create template based sender function
var sendPwdReminder = transporter.templateSender({
    subject: 'Password reminder for {{username}}!',
    text: 'Hello, {{username}}, Your password is: {{ password }}',
    html: 'Hello, {{username}}, Your password is:\n{{ password }}
'
}, {
    from: 'sender@example.com',
});

// use template based sender to send a message
sendPwdReminder({
    to: 'receiver@example.com'
}, {
    username: 'Node Mailer',
    password: '!"\'<>&some-thing'
}, function(err, info){
    if(err){
       console.log('Error');
    }else{
        console.log('Password reminder sent');
    }
});