The form...

// HONEYPOT
$fake1          = $_POST['sender_name'];
$fake2          = $_POST['sender_email'];

if($fake1 || $fake2) {
    die();
}
else {
    // GRAB VARIABLES
    $name           = htmlspecialchars($_POST['name']);
    $email          = htmlspecialchars($_POST['email']);
    $phone          = htmlspecialchars($_POST['topic']);
    $comments       = htmlspecialchars($_POST['comments']);

    // SET UP EMAIL DATA
    $to             = 'cd@guitarart.co.il';
    $subject        = "הודעה חדשה מלקוח";
    $message        = "הפרטים שהתקבלו הם  \n\n  Name: $name\n  Phone: $phone\n  Message: $comments\n";
    $headers        = "From: $email";

    // USE MAIL FUNCTION
    mail($to, $subject, $message, $headers);

    // REDIRECT AFTER SEND
    header("Location: http://www.guitarart.co.il/Thanks.php");
}