I have set moderator approval for new susbcribers, deleted some bogus
email addresses that were listed, and required moderation for addresses
not subscribed to the list. I think now we are safe, since I have time
to check possible spam messages from the list.
As for the archives, it seems that the only way of removing unwanted
messages from there is to edit the mbox file in the server, so maybe
this is a bit trickier.
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