If your list has gotten on a bunch of spamlists (and I'm thinking 
mostly of the Fudge list, here, but some others get some traffic) and 
you keep getting bogus subscribes, you probably want to shift your 
subscription over to "verify."  This'll send out a confirmation email 
(a double-opt-in) to a new subscriber, before they're actually added. 
 No moderator intervention is needed (for that, you want a "closed" 
list, I think).

I think this is going to be the default setting for all new lists.

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Game(s): The Whole Phoenyx
Listowner tools are found at http://www.phoenyx.net/listowners/