Ernie
Yes, after I reread your post, I realized that you weren't saying that all bouncing is a bad usage or spam. I apologize for misunderstanding you. A lot of ppl coming to this thread have made that claim, and I jumped to conclusions.
I do find it to be an effective for responding to specific senders. I get quite a bit of email from people who type the address wrong, on one of my email addresses. I don't feel like typing a response every time (though I suppose I could just set up a canned response), and then getting back apologies, so I use bounce. It seems to work (that is, I don't usually *continue* to get incorrectly addressed messages from the same sender.
On a side note, posters are frequently suggesting searching these forums or "this thread" and I can't see an obvious way to do that, as is common at many other forums. Am I missing an advanced or thread search feature? All I can see is "search communities"