PHP4 HTML Email '!' Problem

[Anon]

Apache 1.3.17/PHP 4.0.4pl1

Hi having a strange problem with a HTML based email... Somehow '!' is appearing in the email when it arrives at the client (Checked on Outlook). It always appears in the same position (Approx 1000+ char)

I have checked the mail logs and all seems ok there....

Apologies if this is a real newbie one

Cheers #8)

Code below....

$html = "html.....etc";
$html .= "etc....

$headers = "From: [e-mail] \n";
$headers .= "X-Sender: <" .$from .">\n";
$headers .= "X-Mailer: PHP\n"; // mailer
$headers .= "X-Priority: 1\n"; // Urgent message!
$headers .= "Return-Path: <" . $from .">\n"; // Return path for errors
$headers .= "Content-Type: text/html; charset=iso-8859-1\n"; // html content

mail ($to, $subject, $html, $headers);