SR Project Honeypot is a Concrete 5 package that integrates into the Concrete 5 Spam framework.
It uses the Project Honeypot API (www.projecthoneypot.org) to check IP and MX addresses and verifies that email addresses are not in lists of known disposable mail servers.
Licence: Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported CC BY-NC-SA 3