When attaching word documents to the email and getting them to post - I have seen issues with the latest MS office 2007 and 2010 when posting. Apparently, the posting will only move the document (AKA media or attachment) being attached with the post. However, the words or the content gets lost. We have to go in and edit the post to get the content added. With the older versions of office - everything works fine. Since this is recent findings between December 2013 and January 2014.
Can you run a few tests using a post with about a page of content and then attaching a word document in DOCX format. See if the post makes it and saves.