SendPress is a free wordpress plugint to create, send, manage and track your email right from WordPress.
Get stats for each newsletter: opens, clicks, unsubscribes
Add a subscription form as a sidebar widget or in your pages
newsletters will look great on the iPhone, in Gmail, Android, Yahoo, Hotmail, etc.
Send with your web host, Gmail or SendPress
Segment your lists based on opened, clicked & bounced
To install SendPress
Login to wordpress (wp-admin).
In your admin dashboard click plugins and select Add New.
Type SendPress in the search field and click Search Plugins button.
After the successfully Installation click the activate Plugin link to activate the plugin.
Download SendPress wordpress plugin. Download link
Unzip and upload it to your WordPress wp-content/plugins directory.
Login to wp-admin. In your admin dashboard click plugins and activate the SendPress wordpress plugin