Qabel/qabel-drop — pull request #12 by L-Henke (2014-10-22 08:16:08+00:00)
Title: Added an empty content header after the first multipart header.

It seems that after the first 'Content-Type: multipart/mixed;' header another Content-Type: with payload is expected. (http://en.wikipedia.org/wiki/MIME#Multipart_messages)

This is the server side fix for https://github.com/Qabel/qabel-core/issues/117.