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mivox - 2:35 am on Dec 28, 2000 (gmt 0)
I'm pretty sure you'd have to use a funky "?" URL, and the script would have to have a section explicitly telling it how to interpret the info after the "?"
I'm pretty sure things like automatic unsubscribe links and automatic form field 'filling-out' would have to be a feature either built-in or added to the list management script.