The free account gives a lot of services to send beautiful e-mail campaigns. It's easy to use and very effective. It gives you a lot of functionalities

Direct integration into Wordpress, User interface is solid, Pre-made forms are handy, building blocks are average in features.

MailPoet may be suitable for people who prefer to do everything within WordPress. Thanks to this plugin it is possible to create and send newsletters without leaving the WordPress administration interface. With MailPoet you can send (and schedule!) both normal newsletters and email sequences as well as automatic notification messages whenever a new post is published. Using drag drop you can easily create your newsletters with text, images as well as choosing text fonts, colors and themes. You can also implement Facebook buttons (share, like), Tweeter and many other social buttons.