We're playing on the extremes:  Totally-identified vs Anonymous.
 
I think that anonymous posting is useful only on some lists, and must
be controlled by LISTSERV as a list option, not by the end-user, by
changing the contents of From: field to "Anonymous <LISTNAME@NODE>",
deleting the Received:, Return-path:, Organization:, and any unusefull
fields usually discarded by LISTSERV from the header, and seting the
Sender: and Reply-to: to the usual "Full List Name <LISTNAME@NODE>".
Only in this situation, full signs and good quotes are
 
Bye...  ++V
Victor Parada G.  <[log in to unmask]> <[log in to unmask]>
 
Hint: Disable your system's automatic sign feature if you are
      posting anonymously.