Whether the list is closed or not, it can still be accessed through the
web.  I only view posts through the web archives avoiding spam altogether.
This allows me to view messages from any computer and respond from any
computer.  If I want a response, I would ask the list to respond to the
list as I am "on the road".  If I want p-mail, then I ask for p-mail and
receive it in my e-mail box.  I am in "nomail" mode on my e-mail address
and never get mail from the list.

Bottom line:
I never see spam (unless it's by choice through the web archive).
I can access the list from anywhere and respond from anywhere.

Another $.02 cents worth

JB