how can I export email addresses from forms?

I think this app is exactly what you need:

http://apps.jotform.com/app/combine_submissions

You can get emails on all of your forms at once. 

Hello,

Sorry for the inconvenience issue. Yes you're right, for now this tool allows only 100 submissions at a time.

I'm escalating the issue to our developers to improve the tool. When we've an update about it, you'll be informed via this topic.

Thank you for contacting us.

Regards.