If you're a sysadmin or you admin your own website and you find that you get a lot of email spammage coming to your site then you can set up what is called a
Honeypot to catch and record spammers and botters.
The way it works is that you generate a file that is referenced in your html code but it is hidden from view. A bot will scour a page for any links and run the hidden file. This file returns data to the honeypot site that contains information (such as the IP of the bot) and is used to then blacklist those IP's. Normal google or search engine spiders are ignored.
The one I use at work and for my own domain is called
ProjectHoneyPot and it has caught quite a few spammers hitting the work domains.