german users, you may know and want to use http://www.cleverreach.de/frontend/?rk=22594fjnolyrs ? Cleverreach for your emailing campaign.
we can take alook to make a tutorial if you confirm it is a popular service in germany. so we could see how their form can be integrated to WP Subscribers.
Actually we tried to get some assistance but the fact it is written in german doesn't help.
you need to be aware they have their own Wordpress plugin
you can download it from http://www.cleverreach.de/download/plug ... dpress.zip
but you need an API and list ID , see this doc to get the information
http://www.cleverreach.com/frontend/api.php
We could support our own implementation if we have support from the company and also more request from customers.