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'
}
});