That's a MIME type :)  They are all over the place, and they can be forged.  Here's how MS handles it:

http://msdn.microsoft.com/library/default.asp?url="">

Matt



Mark E. Smith wrote:
Yeah, just checked on a few of these MIME items and the actual type isn't
defined.
For example, an Excel attachment just says application-octet-stream

-0-

Content-Type: multipart/mixed;boundary="==IMail_v8.1=="
Return-Path: [EMAIL PROTECTED]
X-OriginalArrivalTime: 27 Oct 2004 18:29:21.0419 (UTC)
FILETIME=[E09185B0:01C4BC52]

--==IMail_v8.1==
Content-Transfer-Encoding: 7bit
Content-Type: text/plain; charset=us-ascii

--==IMail_v8.1==
Content-Type: application/octet-stream; name="2004 Technology.xls"
Content-Transfer-Encoding: base64



==================


  
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]] On Behalf Of Rick Davidson
Sent: Wednesday, October 27, 2004 1:33 PM
To: [EMAIL PROTECTED]
Subject: Re: [Declude.JunkMail] Best Practices for handing
legit email flagged as spam?

That is correct, declude virus processes before junkmail

I did look at quite a few zip viruses and didnt see any of
them using the
Content-Type: application/x-zip-compressed in the mime info

Rick Davidson
National Systems Manager
North American Title Group

-
----- Original Message -----
From: "Mark E. Smith" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Wednesday, October 27, 2004 1:03 PM
Subject: RE: [Declude.JunkMail] Best Practices for handing
legit email flagged as spam?


    
Rick,
I was looking at your filter -- great idea.
One question (which falls under the processing order)

If you have:
BODY STOPALLTESTS CONTAINS Content-Type:
      
application/x-zip-compressed
    
I think Declude Virus will still grab this correct?

Mark


      
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]] On Behalf Of Rick
Davidson
Sent: Tuesday, October 26, 2004 10:49 AM
To: [EMAIL PROTECTED]
Subject: Re: [Declude.JunkMail] Best Practices for handing legit
email flagged as spam?

        
1 in 500,000?  That's fantastic.  I think that qualifies for the
anti-spam guru of the week award!
          
heh, that is no exageration either, it is mainly due to
        
spending alot
    
of time in looking at false positives and finding ways to prevent
them. For example use filtering to look for legit mail,
        
the attached
    
filter file runs before all other filters, it contains
        
things that I
    
found in false positives. This file is my number one false
        
positive
    
eliminator, my second method is test the hell out of any
        
significant
    
changes first. I do have the luxury of having to only
        
filter for one
    
company and I can be fairly restrictive....

I will see if I can get my configs somewhere for download, I am
willing to share my work because I hate spam and spammers
        
so much...
    
man do i hate them.

Rick Davidson
National Systems Manager
North American Title Group
-

        
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