Most likely a malformed header created by the sending application.


Depending on how strict an application insists on  CR/LF combinations (vs just 
CR or just LF) – the attachment is either recognized as a distinct MAPI element 
– or treated as excess junk in the headers or some previous MAPI segment.



That’s why it’s still “there” after forwarding it. It was never GONE. It’s not 
just “visible” to certain email applications who have strict standards 
implementations.



You can get to the bottom of it, by setting up a temporary test rule in Declude 
based on the subject or some even the senders address that sends the email to 
some “hold” folder (like the Virus or Junkmail hold folders).  Then, disable 
that rule again. Now you have the “native” message body and you can inspect it 
with a hex editor and you’ll be able to see some issue with quoting or folding 
and then tell the sender how to fix their application to be MAPI compliant.



From: Imail Admin [mailto:imailad...@bcwebhost.net]
Sent: Monday, March 12, 2012 9:11 PM
To: Declude.JunkMail@declude.com
Subject: [Declude.JunkMail] invisible attachments?



Hi,



I have a  problem with invisible attachments and I'm wondering if it's an IMail 
problem, a Declude problem, or something else.



A law firm that I've dealt with for a long time recently has a problem that 
messages send to us with attachments sometimes don't display the attachments.  
They leave the sender with an attachment, but they arrive with no clue that  
there is an attachment.  If I forward them on to a gmail account I use for 
testing, then the attachments are visible there.



I've tested this with both Outlook Express and Mail Live on the receiving end 
and see nothing about the attachments.   I check on an Android phone using K-9 
and it doesn't show the attachments but does show the mail.dat file usually 
associated with Outlook and the formatting of messages (and these senders are 
using Outlook with MS Exchange).  However, the usual fix (use Plain Text Only) 
doesn't seem to help.



My first thought was that the attachments were getting stripped (by Declude?) 
at our server.  But since they still seem to be there once I forward to the 
gmail account, that excludes that idea.  I haven't had any problems receiving 
test JPG files as attachments and sometimes their PDF files get through just 
fine. So any idea what's going on here?



Thanks,



Ben


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