I will return SPAM back with junk of my own. If it bounces; then I will dig into the headers and find the real culprit address and send it to there.
I have been getting these failed delivery emails to a few address but it looks like it is sent out successfully to other email addresses. It is usually some spammy link, what do I do?
I heard doing that is actually a bad idea since your email address is now flagged as 'active' by the spammer and he now knows that someone actively checks that email address. So you'll probably be getting more spam than if you had just ignored it.