Jackpot is a ready-to-run SMTP relay honeypot, written in pure Java.
By running a relay honeypot on your computer, you can make a contribution to the battle against spam email. Jackpot enables you to submit accurately-aimed complaints, with detailed documentation accessible via a built-in web-server.Jackpot is very entertaining to run - you can watch spam getting logged and then blackholed in real-time. You can examine the envelope (HELO) commands used to submit the spam to Jackpot, which is not possible using a simple spamtrap address. The details of spam-runs are saved in comma-delimited files, which you can analyse using simple tools.
Jackpot can also store captured spam-data in a single database shared by a community of co-operating honeypots.
It might be a good idea to read the disclaimer before running it.
The Spamhaus Project provide the data for the SBL lookup at Osirusoft.
Spam.Abuse.net aims to have the best collection of anti-spam links on the Internet. Judge for yourself.