Jurgen,
Mailing-list server programs do include a command to query on the listmembers. It is quite common. There would be no problem in triggering such a query just before posting, and attach the resulting list and the mail in one file, locally on my disk. There would be no problem, then to show a print of this list to a judge, when requested, together with an alive presentation that the mail can indeed be read by anyone on court, who is not necessarily on that list, by simply connecting to the net. I would like to repeat that I am an old friend, that I have been posting long before 1998 (not necessarily on Debian), and that my contribution to this discussion is not going beyond this list. So far, only James Miller and Florian Lohoff have shown a correct reading of this discussion. An explicit OpenContent agreement is indeed the way to go. Sergio