Stefan Ranguelov wrote:

> Is it a problem of the mailing list server and how to deal with it ?

  No.  The list server is working as it should.  The less it mucks about
with headers, the better.

  It behoves those who reply to *think* about to whom they wish to reply
and *act* accordingly.  It's by-and-large a better default for them to
mistakenly reply to one person only, than the opposite.
--
  Cheers,
        Paul B.