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[Sven Hartge <address@concealed>]

Hallo .*,


I worked around my issue by matching on the type of the message part 
instead of trying to match on the Content-Type header:

---------8<------------
title.gettext THM Newsletter

match([msg_part->type],/image/) smtp,dkim,md5,smime    -> 
reject(reason='send_multipart')
match([msg_part->type],/application/)   smtp,dkim,md5,smime    -> 
reject(reason='send_multipart')
true()                             smtp,dkim,smime,md5        -> editorkey
---------8<------------

This works the way I want it to: All mails with binary attachments are 
directly refused and the rest is sent to the admin/moderators.

But I still stand by my statement that 
"match([header->Content-Type],/multipart\/mixed/)" should work for 
signed and unsigned mails and not working for signed mails seems like a 
bug to me.

Mit freundlichen Grüßen,
Sven Hartge

--
Dipl.-Inform. (FH) Sven Hartge
Technische Hochschule Mittelhessen
- University of Applied Sciences  -
    IT-Services Bereich Gießen
Server-, Dienst- und Netz-Administration

Postanschrift: Wiesenstraße 14, 35390 Gießen
Tel.: +49 641 309-1291
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Web: www.its.thm.de, E-Mail: address@concealed

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