Is there a really nice way to offer a subscription (email subscription) to newsletters, which can be integrated really well with WD?

Im simply looking for 1 box - enter email address - and one button - subscribe.

This is extremely easy to do with coffee cup web form builder - but is there a nice way to handle the data (ie list of email addresses) which are obtained afterwards? Rather than manually having to keep them in Excel sheets etc - and an easy way to send out mass mailing?

Thanks