fill out form for genuine email

Is there somethign simple i can install and configure for postfix that send an autoreply to someone sending an email that asks they fill out a form to prove themselves?'

I use debian and vchs.

 

You mean a challenge-response system?

 

If that's the technical term then yes

 

You can try this: http://tmda.net/
According to this FAQ entry: http://wiki.tmda.net/TmdaFaq it works with Postfix.