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There is actually a honeypot I wrote for xoops called xortify on
http://sourceforge.net/p/xortify I can't afford to run web services to run at the moment so it has been down for a couple of years, but that runs the email and addresses for example by stopforumspam.com as well as projecthoneypot.org as well as maintaining bans made on one website on other websites...
When it is back up I am going to implement wammy.snails.email -- my spam API i want to set up a few of the api I worked on when I came back from sick leave after injurying myself with RSI on xoops.org like wammy.xoops.org for us all to use for spam heuristics... they are all sitting on the XOOPS SVN ready to be deployed, but if you need wammy you can get it from
http://github.com/Chronolabs-Cooperative/Wammy-API-PHP or on the
http://sourceforge.net/p/chronolabsapisWith wammy you base on moderation scores develop and adverage of what is allowed in your site based on spam scores, for example something that is removed for spam get passed as training to wammy, something that is in the auto delete queue get run through on training as forgot and other that pass get trained as ham!! Based on the adverage score of what is allowed in for example a forum you can set it up to autoque and park near scores lesser than 100% spam!!
There is also an option you can enable in protector, called stop forum spam, which is a basic implementation in stopping email address sign up spam, the other great thing to do is collect more information and have a 4 steps in the registration form this also stop the signup bots, they just get lost!!