[exim] Demime misses extensions (using Exim 4.34)

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Autor: Christian Hertel
Datum:  
To: exim-users
Betreff: [exim] Demime misses extensions (using Exim 4.34)
Hello allz,

I have the following data_acl configuration:


--- snip ---
acl_check_data:
  deny    message       = Found blacklisted attachment extension: $found_extension
          demime        = txt:pdf
  accept
--- snap ---



Now in most cases, mails containing pdf attachments are rejected now, but if the filename contains i. e. german umlaut characters like ä, ü or ö, Microsoft Outlook (tested with Outlook 2003) creates a mail containing MIME blocks like this one:


--- snip ---
------=_NextPart_000_0030_01C67DB6.D1502C10
Content-Type: application/pdf;
        name="=?iso-8859-1?Q?T=FCbingenhin.pdf?="
Content-Transfer-Encoding: base64
Content-Disposition: attachment;
        filename="=?iso-8859-1?Q?T=FCbingenhin.pdf?="
--- snap ---



In that case, exiscan seems to miss that this mail contains the file "Tübingenhin.pdf", which should be blocked.


I don't know if this is a known bug (I'm using exim 4.34 atm.) and if it has been fixed in a newer version of exim, because I've found nothing about that in the exim-users archives.


Cheers,

--
Christian Hertel
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