I recommend posters re-read bawolff's message:
On Mon, Aug 5, 2013 at 2:51 PM, Brian Wolff bawolff@gmail.com wrote:
https://bugzilla.wikimedia.org/show_bug.cgi?id=52556 sounds related...
--bawolff
lists.wikipedia.org is missing an SPF record in DNS. That is most likely what is causing the email to be flagged. --scott