I'm releasing some javascript that you can put on your webpage that will generate a unique spamgourmet address for each visitor, along with the "sender" directive, so that someone who visits your site can communicate with you indefinitely as the "exclusive sender" for his/her very own disposable address. I added the .js file to the sourceforge subversion repository, and here (
http://www.spamgourmet.com/SgMailto.zip ) is a zip file with the .js file and an example html file. I've seen stuff that's similar to this but most of it has been back end code (like PHP) - this code will work on a static web page.