questi sono gli header... ho visto ora tramite webmin le mail sull'utente:
codice:
From MAILER-DAEMON  Tue Mar 11 14:03:04 2008
Return-Path: <>
X-Original-To: www-data@localhost
Delivered-To: www-data@localhost
Received: by localhost (Postfix)
	id 83E11438B6F; Tue, 11 Mar 2008 14:03:04 +0100 (CET)
Date: Tue, 11 Mar 2008 14:03:04 +0100 (CET)
From: MAILER-DAEMON@localhost (Mail Delivery System)
Subject: Undelivered Mail Returned to Sender
To: www-data@localhost
Auto-Submitted: auto-replied
MIME-Version: 1.0
Content-Type: multipart/report; report-type=delivery-status;
	boundary="77685438B6C.1205240584/localhost"
Message-Id: <20080311130304.83E11438B6F@localhost>

This is a MIME-encapsulated message.

--77685438B6C.1205240584/localhost
Content-Description: Notification
Content-Type: text/plain; charset=us-ascii

This is the mail system at host localhost.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

                   The mail system

<xxxxx@gmail.com>: gmail.com

--77685438B6C.1205240584/localhost
Content-Description: Delivery report
Content-Type: message/delivery-status

Reporting-MTA: dns; localhost
X-Postfix-Queue-ID: 77685438B6C
X-Postfix-Sender: rfc822; www-data@localhost
Arrival-Date: Tue, 11 Mar 2008 14:03:04 +0100 (CET)

Final-Recipient: rfc822; xxxxx@gmail.com
Action: failed
Status: 5.0.0
Diagnostic-Code: X-Postfix; gmail.com

--77685438B6C.1205240584/localhost
Content-Description: Undelivered Message
Content-Type: message/rfc822

Received: by localhost (Postfix, from userid 33)
	id 77685438B6C; Tue, 11 Mar 2008 14:03:04 +0100 (CET)
To: xxxxx@gmail.com
Subject: prova mess
MIME-Version: 1.0
Content-type: text/html; charset=iso-8859-1
To: xxxxx@gmail.com
From: xxxxx@ccccccc.org
Message-Id: <20080311130304.77685438B6C@localhost>
Date: Tue, 11 Mar 2008 14:03:04 +0100 (CET)


Ciao

--77685438B6C.1205240584/localhost--