It is the number of unread spams sitting in my Gmail spam folder, which kills old content as it grows older than 30 days. A couple hundred or so I put there myself because Gmail's filter missed them, but the rest are the filter's work.
Oh, and that's in mili-spams received a second. So my current spam rate is nearly 8 milispams a second (which is nearly 29 spams an hour), up from the average of 5 milispams a second (which is 18 spams an hour).
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I don't know how well it works offhand, but a friend of mine once suggested Greylisting.
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