Anti-Spam Blacklist Thing lets you check to see if a given IP address or hostname is on one of up to 20 different anti-spam blacklists. Anti-Spam Blacklist Thing is provided by SpamButcher completely free of charge. This application may be of use to individuals troubleshooting email delivery issues, performing anti-spam research or are otherwise responsible for email servers. The tool may be readily customized to query any blacklists the user wishes.