Project Honey Pot is a bridge that provides domain owners the ability to share email harvesting attempts with the community. On the website you can download a pre-made and customized script for implementation on your website. Go to:
Register yourself. Then click “install new honey pot”. Place it in a directory on your domain. Traverse to the directory in a browser. Select the button that completes the setup, and the continue following the instructions provided to you. When you add links to your website I recommend adding the nofollow rel tag. Albeit use of this tag is widely debated, I don’t think it can hurt. You will get statistics on your projecthoneypot.com homepage with the incident of email harvesters coming to your domain.
Set one up. Participate. If your domain receives any spam your website is most likely being visited by email harvesters.