PHP Email Submission

Question

just created a basic php file for email submission, but when i hit submit, i don't receive an email at all. I really can't spot my mistake - i'm using VS Code & Xampp.

this is my html form:

<section class="contact-section info-block" id="contact">
                <div class="contact-wrapper">
                    <div class="contact-heading">
                        <h2 class="section-heading"> Contact </h2>
                    </div>
                    <div class="contact-form">
                        <form id="contact-form" method="post" action="contact-handler.php">
                            <p>
                                <input name="name" type="text" class="form-control" placeholder="name" required>
                            </p>
                            <p>
                                <input name="email" type="email" class="form-control" placeholder="email adress" required>
                            </p>
                            <p>
                                <textarea name="message" class="form-control" placeholder="message" row="4" required></textarea>
                            </p>
                            <input type="submit" class="form-control submit" value="Submit Message">
                        </form>
                    </div>
                </div>
            </section>

and here is my php file:

<?php
    $name = $_POST['name'];
    $visitor_email = $_POST['email'];
    $message = $_POST['message'];

    $email_from = 'myWebsite.com';
    $email_subject ='New Submission';
    $email_body = "User Name: $name.\n". 
                    "User Email: $visitor_email.\n".
                        "User Message: $message.\n";

    $to = "blabla@MyEmailadress.com";

    $headers = "From: $email_from\r\n";

    $headers .= "Reply-To: $visitor_email\r\n";

    mail($to,$email_subject,$email_body,$headers);

    header("Location: index.html");
?>

Can someone spot the issue? I'm also thankful for improvements because i'm a beginner and still learning. Thanks in advance!