Feedburner’s e-mail subscriptions are one of the most efficient ways to increase the number of RSS subscribers you have. All the subscribers need to do is enter their e-mail address on your blog and then verify their subscriptions by going to Feedburner site.
But sometimes these precious subscribers forget to verify their subscriptions. In these cases you can always send an e-mail asking them to verify their subscriptions. But searching through the huge e-mail subscribers list looking for unconfirmed subscribers is not an easy task. But as always a plugin is now available to do the same.
Keith has created a WordPress plugin that sends every unconfirmed e-mail subscriber of your RSS feed a customized reminder message.  Installation is the same as any other WordPress plugin. Upload and activate it. You can then find the plugin under the ‘Manage’ tab. Just enter your FeedBurner username and password and you will be able to see which subscribers haven’t confirmed their e-mail address.
So what are you waiting for ? Go increase your RSS subscribers !
Download Notify Unconfirmed Subscribers Plugin for WordPress