MailScanner could not analyze some mails

[Pascal Maes]

Hello,

All the mails like the following are put in quarantine because  
MailScanner "Could not analyze message" and the recipient receives and  
advertising in place ot the message.

The message seems very simple, that what I receive after the release  
from the quarantine :

Received: from smtp3.sgsi.ucl.ac.be ([10.1.5.3])
by mmp.sipr-dc.ucl.ac.be (Sun Java(tm) System Messaging Server  
6.3-4.01 (built
Aug  3 2007; 32bit)) with ESMTP id <0JSZ00A9BBOXUM40 at mmp.sipr-dc.ucl.ac.be 
 >
for my-address; Thu, 13 Dec 2007 09:31:45 +0100 (CET)
Received: from smtp3.sgsi.ucl.ac.be (localhost.localdomain [127.0.0.1])
by smtp3.sgsi.ucl.ac.be (Postfix) with ESMTP id A92821C6E9C	for
<my-address>; Wed, 12 Dec 2007 14:10:15 +0100 (CET)
Received: from mail6.e-zone.net (mail6.e-zone.net [212.35.125.173])
by smtp3.sgsi.ucl.ac.be (Postfix) with ESMTP	for <my-address>;
Wed, 12 Dec 2007 14:10:15 +0100 (CET)
Date: Wed, 12 Dec 2007 14:09:28 +0100
From: postmaster at legat.eu
Subject: Delivery failure (toto at legat.eu)
To: my-address
Message-id: <B0053573598 at mail6.e-zone.net>
MIME-version: 1.0
Content-type: multipart/report; report-type=delivery-status
X-AV-Checked: ClamAV using ClamSMTP

This is a multi-part message in MIME format.


--20354/1197464968/MailSite/6760/3916
Content-Transfer-Encoding: quoted-printable
Content-Type: text/plain; charset="us-ascii"

Your message has encountered delivery problems
to the following recipient(s):

toto at legat.eu
Delivery failed
User not known



--20354/1197464968/MailSite/6760/3916
Content-Disposition: attachment; filename="DSN475FDC94.txt"
Content-Transfer-Encoding: quoted-printable
Content-Type: message/delivery-status; charset="utf-8"

Reporting-MTA: mail.register.be
Received-From-MTA: dns; smtp3.sgsi.ucl.ac.be (unverified [130.104.5.77])
Arrival-Date: Wed, 12 Dec 2007 14:05:24 +0100

Final-Recipient: rfc822; toto at legat.eu
Action: failed
Status: 5.1.1 (Permanent failure - addressing: bad destination mailbox  
ad=
dress)


--20354/1197464968/MailSite/6760/3916
Content-Type: message/rfc822; charset="utf-8"

X-Spam-Score: 1
Received: from smtp3.sgsi.ucl.ac.be (unverified [130.104.5.77]) by  
mail.register.be
(Rockliffe SMTPRA 7.0.6) with ESMTP id <B0053572805 at mail.register.be>  
for <toto at legat.eu>;
Wed, 12 Dec 2007 14:05:24 +0100
Received: from smtp3.sgsi.ucl.ac.be (localhost.localdomain [127.0.0.1])
	by smtp3.sgsi.ucl.ac.be (Postfix) with ESMTP id 41BD11C65B3;
	Wed, 12 Dec 2007 13:50:08 +0100 (CET)
Received: from Ulysse.elec.ucl.ac.be (Ulysse.elec.ucl.ac.be  
[130.104.236.7])
	(using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits))
	(No client certificate requested)
	by smtp3.sgsi.ucl.ac.be (Postfix) with ESMTP;
	Wed, 12 Dec 2007 13:50:08 +0100 (CET)
Message-ID: <475FD8F8.1010109 at uclouvain.be>
Disposition-Notification-To: Pascal Maes <my-address>
Date: Wed, 12 Dec 2007 13:50:00 +0100
From: Pascal Maes <my-address>
User-Agent: Thunderbird 2.0.0.9 (Macintosh/20071031)
MIME-Version: 1.0
To: toto at legat.eu
Subject: test
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
X-AV-Checked: ClamAV using ClamSMTP
X-Sgsi-Spamcheck: Authenticated,
X-SGSI-MailScanner: Found to be clean
X-SGSI-From: my-address
X-SGSI-Spam-Status: No

test
--20354/1197464968/MailSite/6760/3916--


Questions

  - why that kind of email could no be analyzed ?
  - Does a workaround exist ?
  - How can we distribute these kind of emails ?

Thanks
--
Pascal