İletişim formu çalışmıyor, yardım edebilecek var mı?

<?php
    
    if( empty( $_POST['token'] ) ){
        echo '<span class="notice">Error!</span>';
        exit;
    }
    if( $_POST['token'] != 'FsWga4&@f6aw' ){
        echo '<span class="notice">Error!</span>';
        exit;
    }
    
    $name = $_POST['name'];
    $from = $_POST['email'];
    $phone = $_POST['phone'];
    $subject = stripslashes( nl2br( $_POST['subject'] ) );
    $message = stripslashes( nl2br( $_POST['message'] ) );
    
    $headers ="From: Form Contact <$from>\n";
    $headers.="MIME-Version: 1.0\n";
    $headers.="Content-type: text/html; charset=iso 8859-1";
    
    ob_start();
    ?>
        Hi GSRthemes9!<br /><br />
        <?php echo ucfirst( $name ); ?> has sent you a message via contact form on your website!
        <br /><br />
        
        Name: <?php echo ucfirst( $name ); ?><br />
        Email: <?php echo $from; ?><br />
        Phone: <?php echo $phone; ?><br />
        Subject: <?php echo $subject; ?><br />
        Message: <br /><br />
        <?php echo $message; ?>
        <br />
        <br />
        ============================================================
    <?php
    $body = ob_get_contents();
    ob_end_clean();
    
    $to = 'tiogok@gmail.com';

    $s = mail($to,$subject,$body,$headers,"-t -i -f $from");

    if( $s == 1 ){
        echo '<div class="success"><i class="fa fa-check-circle"></i><h3>Thank You!</h3>Your message has been sent successfully.</div>';
    }else{
        echo '<div>Your message sending failed!</div>';
    }

    
?>

echo '<div>Your message sending failed!</div>';

echo '<div>'.error_get_last()['message'] .'</div>';