MailMunch – Email & Newsletter Marketing Plugins for WordPress
It’s fair to say that MailMunch and Hustle are somewhat similar in scope. Where they differ is that MailMunch really is solely focused on email marketing. You can create a variety of different opt-ins ranging from popups, embedded forms, top bar, scroll box, and sidebar.
The plugin is compatible with many third-party services (AWeber, Campaign Monitor, Constant Contact, GetResponse, InfusionSoft, and MailChimp). You can also take advantage of A/B testing and analytics.
credit : MailMunch