too long

I am trying to make messages show newline characters as the customer types it, but I am getting /r/n between each line. I also want the $body .= $_SESSION['username']; to appear on a separate line.

I have tried to use this example: PHP nl2br() basic function to solve, but have not been successful.

PHP:

$body .= $_SESSION['username'];
$body .= $message;
$to = $email;
$subject = "copy of your notification"; 
$headers = "From: noti@r.co.uk
";  
$headers  .= 'MIME-Version: 1.0' . "
";
$headers .= 'Content-type: text/html; charset=iso-8859-1' . "
";
$headers .= 'Bcc:noti@r.co.uk' . "
";
mail($to,$subject,$body,$headers);

HTML form:

<form action="notification.php" method="Post" class="rl">
    <div>
        <label for="message" class="fixedwidth">Message</label>
        <textarea name="message" rows="7" cols="40" id="message"></textarea>
    </div>

    <div class="buttonarea">
        <p>
            <input type="submit" name="notify" value="Notify"></p>
        </div>
    </p>
</form>

You could try using the PHP_EOL constant:

$body .= $_SESSION['username'].PHP_EOL;