Mailer encountered file attachment problems

[MAILER-DAEMON]

Your message to <address@hidden> contained attachments which are currently 
blocked because they MAY contain a virus.
Your message to <address@hidden> was deleted.
 
Rejected file types are: 
pif|com|exe|vbs|bat|scr|lnk|eml|cmd|mim|uue|uu|b64|bhx|hqx|xxe|zip
 
The original message's headers follow so you may determine if you really sent 
the deleted email
 
http://www.google.com/search?num=30&q=%22understanding+email+headers%22
................................................ 
Received: from [166.111.107.48] (HELO stthomasu.ca)
  by stthomasu.ca (CommuniGate Pro SMTP 3.5.9)
  with SMTP id 19161000 for address@hidden; Tue, 20 Apr 2004 08:19:23 -0300
From: address@hidden
To: address@hidden
Subject: unknown
Date: Tue, 23 Mar 2004 19:20:18 +0800
MIME-Version: 1.0
Content-Type: multipart/mixed; boundary="27283850"
Message-ID: <address@hidden>

Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit

Content-Type: application/x-zip-compressed; name="ps.zip"
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="ps.zip"