I just ran into something last week that I hadn't seen before (I don't hand out address' often so don't get much spam).
A spam bot that emailed random email address' on my domain (which has a catch-all) with the same address as the return address... when it bounced, which it did because of my spam filters, it bounced back to that same invalid address, so I recieved it anyway.
Mark Andreas Boehmer [Addictive Media] wrote:
I came across an article at some point that suggested to "spam" the bots with fake email addresses: the authors suggested to create a link for the spam-bots to follow to a page that randomly creates hundreds of fake email addresses (using php or other server-side scripting). Those addresses are collected by the spam bots and in turn bombard its own mail server with bouncing emails.
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