I didn't even realize how bounce worked until I posted the link to bring it back and got all the scathing comments. I didn't end up using it as a result of having it explained so politely....not....
Over the past 3 weeks I have gone from maybe 1 spam email every few months to up to 40 a day. In researching what might be the cause and how to fix the problem I came across these posts about Bounce being removed from Lion. Having just upgraded to Lion, I assumed this was the reason I was now receiving a ton of email spam. I didn't even know Bounce existed prior to this.
Since I know understand how bounce works and don't use it, it would be really helpful if anyone has any insight into the enormous jump in email spam and how I might handle it.