Thanks for reaching out to us regarding this query.
While I’m yet to try any newsletter or landing page plugins with the theme, I’m going to refer you to the best of both of these that you could possibly find.
Top 5 WordPress Landing Page Plugins – http://www.bloggingwizard.com/top-wordpress-landing-page-plugins/
Top 10 WordPress Newsletter Plugins – http://memorypointer.com/best-wordpress-newsletter-plugins/
I hope these help.