How to use Hustle for local NL plugins

Hey there,

there are quite a few famouse Newsletter plugins for WordPress like Mailpoet, Sendpress, The Newsletter Plugin, Mailster (former mymail) and probably some more. I wonder why Hustle only supports to feed into external services.

I know I can export the entries into a simple list but that doesn’t do double optin or anything else.

Or ist there probably a way that I didn’t see so far?