[Users] Threading with groups.io, broken by groups.io policy it seems.

[Brian Morrison]

I notice that my replies to groups.io groups via email are not threading
correctly, it turns out that the Message-Id: header is being
substituted with a groups.io message ID and the original is being put
into an X-Orig-Message-Id: header.

I don't remember Claws being able to use this X- header, but if it can
how do I do it? Alternatively could this be added as feature request
please.

-- 

Brian Morrison

                "I am not young enough to know everything"
                                                          Oscar Wilde