Who obtained those headers, and how do do we know they are legit?
Only a few people must have acess to the linuxfoundation.org mail servers. Does the linuxfoundation publish all the headers for the public to view, or do you need access to its mail servers to view them? If I can't view the originals myself I want proof they came from a reliable source.
On a mailing list such as the one in question, the headers associated with a list message are replicated to everyone on the list, with each list item they receive from the list.