do not heed. Some traps block access from the client's IP as soon as the trap is accessed. Others, like a network tarpit, are designed to waste the time and resources of malicious spiders by slowly and endlessly feeding the spider useless information. The "bait" content may contain large numbers of fake addresses, a technique known as list poisoning; though some consider this practice harmful. See also Anti-spam techniques Email spam Web crawler Web scraping References