Hmm, I know that when we bought an email list for our target demo we ended up with a couple of honeypot addresses and an e-mail from the source asking who got t

Hmm, I know that when we bought an email list for our target demo we ended up with a couple of honeypot addresses and an e-mail from the source asking who got the list from, complete with legal threats if we didn't assist in their investigation. This is cheap enough that if you have concerns about insiders you might want to set something like that up.