a different type of mail problem

I am using the following function to send out emails via PHP: function SendEMail( $to, $subject, $body ) { $additionalHeaders = "MIME-Version: 1.0\n";

        	$additionalHeaders .= "Content-type: text/html; charset=\"iso-8859-1\"\n";

$additionalHeaders .= "Content-Transfer-Encoding: 7bit\n"; $additionalHeaders .= "Return-path:webmaster@thecanvasexpert.com\n"; $additionalHeaders .= "Reply-To:webmaster@thecanvasexpert.com\n"; $additionalHeaders .= "Sender:webmaster@thecanvasexpert.com\n"; mail( $to, $subject, $body, "From: webmaster@thecanvasexpert.com\n" . $additionalHeaders ); } This way I get consistent headers... However, when I actually get the emails here are the headers I get: Envelope-to: justformailinglists@wizaerd.com Delivery-date: Wed, 18 Apr 2001 12:49:29 -0400 Received: from nobody by artemis.jtlnet.com with local (Exim 3.20 #1)

         id 14pv8z-0004VT-00
         for justformailinglists@wizaerd.com; Wed, 18 Apr 2001 12:49:29 -0400

To: justformailinglists@wizaerd.com Subject: [TCE] - Confirmation Required From: webmaster@thecanvasexpert.com MIME-Version: 1.0 Content-type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Reply-To: webmaster@thecanvasexpert.com Message-Id: <E14pv8z-0004VT-00@artemis.jtlnet.com> Sender: Nobody <nobody@artemis.jtlnet.com> Date: Wed, 18 Apr 2001 12:49:29 -0400 Notice the Sender element does not reflect what I've sent, showing Nobody instead. My hosting provider states it's because their upstream demanded them to set it up this way to prevent spam emails... Is this accurate? If not, what can I tell my ISP to change how emails are sent out?