You have to _always_ return the same 10 e-mails (what do you do if one of them gets deleted)
the variety of the 10 e-mails is not likely to be very large, so you may not be able to confirm every detail about one particular e-mail, but you can do a pretty good job of confirming every detail about all of the 10 e-mails, even if you can't absolutely know which permutations of details belong to each message (and you can make pretty intelligent guesses)
the bucket size needs to be pretty large, and contain a 'good' mix of data. At that point what was the value of your search again?
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