
dgatwood
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Seems to me that the bigger problem is when people have moved since they put in the shipping address originally, and mere validation won't catch that problem -- there's no substitute for folks logging in and providing the new address, in these cases.
Maybe it would be a good idea to do one of those mass emails and let people know that the products are on their way from China and that people need to log in and make sure their postal mail addresses are up-to-date.