Hi Jesper, you can try http://www.formester.com it will help you do the same.

I asked the exact same question and it seems possible to do. I have my blog on classandobjects and I wanted to get subscribers on my site. I looked for multiple alternatives and either they were very costly or didn't work as I intended them to do. So I went ahead and build a solution Formester which solved all my problems. Then I planned to make it available to everyone and here it is. Give it a try and let me know if we can add new features that solve other use cases that you may have.

I think http://www.formester.com/ has an affordable and easy to use solution. It is actively under construction and cool new features are on the way. I was pained by all the solutions out there so went over to make this. I hope it will ease you problems too. :)