Using SMTP

If you need to use a custom SMTP server, configure it like this:

let transporter = nodemailer.createTransport({
    host: 'smtp.example.com',
    port: 587, // or 465 for SSL
    secure: false, // true for 465, false for other ports
    auth: {
        user: 'your-username',
        pass: 'your-password'
    }
});