[log in to unmask] writes:
 > What about a challenge-response mechanism?
 >
 > List members passed automatically.
 >
 > Non-members get an auto-reply with an embedded code.
 > If they re-reply, their address is added to a second pass list
 > other than the "member" list.

Seems good to me.

Pascal.

--

--|------------------------------------------------------
--| Pascal Obry                           Team-Ada Member
--| 45, rue Gabriel Peri - 78114 Magny Les Hameaux FRANCE
--|------------------------------------------------------
--|         http://perso.wanadoo.fr/pascal.obry
--|
--| "The best way to travel is by means of imagination"