SendPress is a lightweight and user friendly newsletter/email system for WordPress, by brewlabs.
Quickly create, design and edit emails to send to your subscribers.
Simple editor. With an html-free experience
Easy to use theme styler
Get stats for each newsletter: opens, clicks, unsubscribes
Add a subscription form as a sidebar widget or in your pages
Your newsletters will look great on the iPhone, in Gmail, Android, Yahoo, Hotmail, etc.
Send with your web host, Gmail or SendPress ( coming soon )
Segment your lists based on opened, clicked & bounced
Requires: WordPress version 3.3+, MySQL 5 and PHP 5.
Plugin homepage: Xperiablog.net