Stew Dellow

WP Simple Subscriber simply collects data for an external Newsletter service of your choice. All data is exportable as a CSV file for use with mainstream services like Campaign Monitor, Dot Mailer etc. This plugin does not provide a way to send out newsletters.

WP Simple Subscriber

Allows you to collect subscribers via a simple form (in a shortcode) or your own custom form.

Webaholicson

This plugin allows your blog visitors to subscribe to your blog via email and receive notifications whenever you create a new post. You can control everything from the WordPress admin.
Use the <code><?php get_epicwin_box(); ?></code> template tag to add a subscribe box anywhere on your WordPress site.
Please remember to rate if you like or dislike the plugin, your feedback keeps me motivated and always improving the plugin.
**** IMPORTANT *****
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Since version 1.2 the plugin has switched the mail system from mail() to sendmail. Please update your plugin immediately if you are using a version older than 1.2.
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Always remember to back up your data before upgrading the plugin as the re-installation of the plugin will wipe out all subscribers from the database.
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Back up your subscribers by using the export options and then use the generated file to import them after the upgrade has been finished.
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Epicwin Plugin

This plugin allows your blog visitors to subscribe to your blog via email and receive notifications whenever you create a new post.

WP Simple Subscriber vs Epicwin Plugin