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From: David Engster <deng@randomsample.de>
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Subject: Parsing Content-Type with repeated attributes
Date: Mon, 11 Oct 2010 14:11:17 +0200
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I just got a mail with the following Content-Type:

Content-Type: application/x-pkcs7-mime;smime-type=signed-data;name=smime.p7m; smime-type=signed-data; name="smime.p7m"

This belongs to a base64 encoded mail with S/MIME signing. Now, this
Content-Type was obviously produced by some strange mail software
(*cough* X-MimeOLE: Produced By Microsoft Exchange V6.5 *cough*), but
when you run that Content-Type through `rfc2231-parse-qp-string', it
produces

("content-type:application/x-pkcs7-mime"
 (name . "smime.p7msmime.p7m")
 (smime-type . "signed-datasigned-data"))

I first thought this was a bug, but it seems the above rfc2231 function
concats those strings very deliberately... Gnus also actually tries to
verify the mail, but with the old mm-view-pkcs7-verify and I'm using EPG
with gpgsm.

-David