[Exim] Content filter

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Author: Hana Breyer Priselac
Date:  
To: exim-users
Subject: [Exim] Content filter
Hello,

I really like this list, ever since I got good answers to some beginners
questions of mine. Now I have some more questions. Aplologise for the length
in advance.

I need to scan all incoming mail and be very restrictive about what comes
in. (Company policy) I've used the _very_nice_ Generic Windows Executable
Content filter found on www.exim.org . Nice filter for most people, but not
for those using non-ascii characters in filenames.

Like, here, in Croatia, we often use ISO-8859-2 for encoding. When I create
a file named Pročitajte.doc (wonder what this will look like for people with
mail readers that don't support ISO), Outlook makes a header like this:

Content-Disposition: attachment;
filename="=?iso-8859-2?Q?Pro=E8itajte=2Edoc?="

The same happens when I have an executable, Čiča.exe (if you can't read
this, that is an exe file with ISO characters in name, nothing unusual)
becomes:

Content-Disposition: attachment;
filename="=?iso-8859-2?B?yGnoYS5leGU=?="

As you may notice, no trace of "exe" is left around and the SYSTEM FILTER
DOESN'T RECOGNISE it.

If anyone has any idea how to filter executables with non-ascii names -
help!



Hana Breyer Priselac
sysadmin