Re:scam is an e-mail chat bot designed to waste scammers' time

Re:scam, developed by Netsafe, engages with scammers over email, asking them a never-ending series of questions. It imitates real human tendencies, complete with humour and grammatical errors.
 
The aim is to turn the table on scammers by wasting their time, and ultimately damage their profits. Re:scam will continue the conversation indefinitely, or until the scammer stops replying. The would-be victim's email address is not used.

Source: www.stuff.co.nz