Teergrube

Teergrube, which is the German word for tar pit, is a trap for spammers who use an address harvester; a mail server deliberately set up to be really slow. To activate it, scatter addresses that look like users on the teergrube's host in places where the address harvester will be trolling. The address harvester will collect the address. When the spammer tries to mailbomb it, his mailer will get stuck.