Personally, I would prefer  List,Respect  or  Both,Respect
 
With Both,Respect  both the list address and the sender address
are in the header and the person who replies can choose to use both
or either, if, of course, the person pauses to think about it, knows
how and the mail system allows it.
 
Sometimes one does not want replies going to the list (surveys, etc.)
and Respect allows the sender to specify the Reply-to: field.
 
Douglas
       Douglas Winship   Hays County, Texas  [log in to unmask]
                    Secondary AUTOCAT Listowner
                              MEDLAB-L