When gnus is unplugged status , nnmail-check-syntax insert
  Message-ID header like this.

    Message-ID: <86emtfltdv.fsf@totally-fudged-out-message-id>

;; Message-ID is not member of message-required-news-headers.
;; In this case , I want to add Message-ID header by ISP news server.

  In plugged status gnus-agent-send-drafts typing "JS" in group
  buffer, Message-ID header is still above line.

  Is that right ??

  So , I make following patch.
  Please apply in pGnus-0.32.

  Thanks.