Quoting Justin Mason (jm at jmason.org):
> There is another alternative, which I hacked up for the IIU list
> using a perl "condom" [1] around the list addr. Instead of requiring
> list mgr approval, it replies to an unsubscribed sender asking for
> confirmation with a "magic keyword", and once the confirm comes in,
> allows the mail through. Less work for the moderator...
>>http://jmason.org/software/scripts/mailman-block-non-members.txt
Pretty neat. That would halt drive-by list-spammings of the fully
automated variety, unless and until it became widely enough adopted that
the bad guys auto-parsed that magic token to get approval
illegitimately.
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