PHP is a new thing for me and I'm trying to build this simple form to send mail. I've seen tutorials and documentations and it seems that I need mail hosting (got one) and a domain for this hosting. So my question is is it possible to build this form using just XAMPP or do I have to have real domain?
You can build your PHPMailer web app on XAMPP on localhost. Later you can transfer the web form to your website hosting on your domain.