Yes, that's how I understand the term "bounce". But I've seen some mail programs (the Mac mail app perhaps) that distinguishes between "bounce" (meaning bounce the mail back to sender as undeliverable) and "redirect" (meaning redirect the mail to another user, but make it look like it came from the original sender).

I think that both of these features would be useful.

--
<http://dave.org.uk>

"The first rule of Perl club is you do not talk about Perl club."
-- Chip Salzenberg

so you could "pretend" that the email bounced, in an effort to maybe get someone to stop emailing you?

Well, that might be nice, but it's not exactly what I meant. By "bounce" I mean send it on to another address without changing the headers. It's more useful than it might sound.