From my benchmark on the topic, it seems that using MailChimp is the recommended/state-of-the-art solution for newsletter (with some add-on like collective.mailchimp to integrate it with Plone).
But in situations where for one reason or another (e.g. confidentiality issues) it is not possible to use external services, what is the recommended (on-premises) solution for creating newsletters integrated with Plone?
Is Singing and Dancing still an option? Is it Plone5 compatible?