Does SPAMfighter bounce spam mails, so spammers think that my address does not exist?
No, certainly not. First of all, it doesn’t work. Unfortunately, spammers are not that stupid, and on top of that, almost all spammers are spoofing, meaning faking the “From” address. Just imagine if it was your address they used, and you got thousands of bounced emails. What’s more, spammers who don’t fake the “From” address are constantly deleting and creating new user names (which is why it’s never a good idea to reply to spam asking to be “removed”). In other words, the best case is it’s a waste of time and resources.