From the register [theregister.co.uk]
Brian Weinreich has been trolling spammers for two years using a bot that fires realistic and ridiculous replies to the pervasive online salespeople.
He simply forwards unwanted emails to a specific address and the bot takes over. Offering the spammers open ended questions that they fall over themselves to answer.
My favourite bit from Brian's blog [medium.com] is "after the first month, I didn’t have to feed the Looper anymore. People were just spamming it on their own.". The spammers were selling on the list of "bitters" to other spammers.
The code [github.com] is on GitHub