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mail header altered when adding a zip file

P: n/a
Hi all. I don't know if this post is really at the right place but I hope someone can help me..

I developed a NT service, in order to automate mail exchanges between different kind of users
This service uses the POP3 and SMTP protocoles to perform the task
Because we have a very heavy security policy, with no accessible SMTP gateways, I coded the use of Outlook (only for sending) as an evolution, with the classical outlook.application, etc

All works fine. all but a mere thing : when we attach a compressed file (can be a ZIP or a CAB file) WITHOUT password, the mail header seems to be altered. here are the results of our tests and an important point of the security policy

security policy concerning mail attachements : when a mail is sent or received with a compressed attachement, the file is scanned, excepted when it is password protected
the internal mail server is Exchange 5.

first test : sending a mail with no compressed attachement to "freesurf.fr" (also done with "wanadoo.fr"
the mail is well received, the freesurf's webmail client shows an attachement flag, and the attachement can be downloaded

second test : sending a mail with a password protected compressed attachement to "freesurf.fr" (also done with "wanadoo.fr"
the mail is well received, the freesurf's webmail client shows an attachement flag, and the attachement can be downloaded

third test : sending a mail with a non password protected compressed attachement to "freesurf.fr" (also done with "wanadoo.fr"
the mail is well received, but the freesurf's webmail client doesn't show the attachement flag. nevertheless, the file can be downloaded because it's attached to the message

I point out one possible cause : our antivirus software (or maybe Exchange) modifies the mail header, so the attachement definition is lost (or maybe the type "multipart/mixed" is lost or modified

if someone already heard of this, and have any idea or knows a solution, I would be very pleased to listen to him :
th

F DG.
Nov 16 '05 #1
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