Created attachment 1012080 [details]
shortened email source code

Description of problem:
I got an email containing multiple attachments. Only one of them is being displayed although all of them are in the message source.
If I forward this email, I see all attachments. Only when I read, they are not visible.
I have disabled all plugins. But failed to find a workaround.

Version-Release number of selected component (if applicable):
Issue at receiver: 3.12.11 (sender: 3.12.10-0ubuntu1~14.10.1)

How reproducible:
The email is no secret, but I don't want to post it to the public. I will attach a shortened version here. Dear developer, please contact me, I will send you this email.

In all cases, I had this problem with application/xml attachments.

Steps to Reproduce:
1. Receive such an email
2. Open them in preview: Invisible, Same in full message read view
3. "Edit as new" => all attachments are visible

Additional info:
MAYBE the there is an issue with the attachment header sequence?

These attachments ARE NOT displayed:

Content-Type: application/xml; name="EDDF.procedures.xml"
Content-Disposition: attachment; filename="EDDF.procedures.xml"
Content-Transfer-Encoding: base64

...

Content-Type: application/xml; name="EDDF.xml"
Content-Disposition: attachment; filename="EDDF.xml"
Content-Transfer-Encoding: base64

...

This attachment is being displayed:

Content-Disposition: attachment; filename="openradar.log"
Content-Type: text/x-log; name="openradar.log"; charset="UTF-8"
Content-Transfer-Encoding: base64