attachment with missing Content-Disposition

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+Message-ID: <20130508131538.4060.37894@hoothoot>\r
+From: Johannes Schauer <j.schauer@email.de>\r
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+Subject: attachment with missing Content-Disposition\r
+Date: Wed, 08 May 2013 15:15:38 +0200\r
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+\r
+Hi,\r
+\r
+I recently received a multipart email with one of the parts being a pdf but=\r
+ the\r
+part was not marked with "Content-Disposition: attachment". This let to not=\r
+much\r
+not adding tag:attachment to it.\r
+\r
+The sender assured me that he used Outlook 2013 but I can't reproduce the\r
+problem myself as I dont have microsoft products at hand. But if Outlook 20=\r
+13\r
+indeed adds attachments without setting "Content-Disposition: attachment", =\r
+then\r
+maybe the problem of notmuch not recognizing them as such is more severe?\r
+\r
+The question is also what to do about it and how to detect attachments of t=\r
+his\r
+kind. Apparently Thunderbird detects attachments that dont say\r
+"Content-Disposition: attachment" but I did not try to figure out what its\r
+heuristic is. Also the microsoft exchange server web client is able to figu=\r
+re\r
+out that this part is supposed to be an attachment. What do other MUAs do?\r
+\r
+So how to create a good heuristic? Using the Content-Type? In my case, the\r
+supposed attachment was "application/octet-stream" for which it is probably\r
+unambiguous that it is an attachment and not inline?\r
+\r
+Alternatively, how about making attachment detection configurable so that\r
+everybody is free to decide himself what he wants to be treated as attachme=\r
+nt?\r
+\r
+cheers, josch\r