Threading is foobared?

[Random832]

On Sat, Mar 26, 2016, at 23:18, Ben Finney wrote:
> What you've demonstrated is that at least one host is violating
> communication standards by altering existing reference fields on
> messages in transit.

The usenet gateway relays posts that originated on the mailing list to
usenet with their *Message-ID* replaced wholesale with
"<mailman.*.python-list at python.org>" - 90% of the time when I've traced
a broken thread this has been to blame, and I've complained at least
twice of this before, once not two weeks ago.