The only real problem with filtering the bounce messages, is that you will also filter out any REAL bounce messages as well. When you get a real one of these, you really want to get it...
On a side note - testing for validity by re-checking the originating server would be a pain - I have 4 different email addresses and (generally) use the local mail server to send (by and large ISPs don't require authentication on their mail servers when you are 'inside' that ISP). So while I regularly use two different mail servers to send, neither of them are the incoming mail server of my main email address. Bloody hard to verify that kind of thing...
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who hid my keyboard's PANIC button?
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