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I've used Joomailer with Mailchimp in a couple sites and had great success. However the latest version seems to be missing the signup module, and support is unresponsive. Not typical of the developer, but also not helpful when trying to get running.
Worked on first install, but it takes a little exploration to understand how to make a survey. New users need to review the WIKI.
I look forward to more releases, and particularly a mod that will show results to users.