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What is Project Honey Pot?

Project Honey Pot is the first and only distributed system for identifying spammers and the spambots they use to scrape addresses from your website. Using the Project Honey Pot system you can install addresses that are custom-tagged to the time and IP address of a visitor to your site. If one of these addresses begins receiving email we not only can tell that the messages are spam, but also the exact moment when the address was harvested and the IP address that gathered it. More information here.

Does this work with cache plugins?

Not yet. It is do-able but it requires .htaccess hacking and folder relocation. I would rather make this plugin cacheable and plug-and-play than release a hack.

How do I upgrade from Jan's original plugin and not lose data?

The code has been written to be backwards compatible with Jan's original plugin. The plugin will look for 'phphttpbllog' first and if that table doesn't exist, then it will look for 'httpbl_log' to do its logging. So all you have to do is activate the plugin and use it.