Most of the time readers who subscribe to your blog through Email subscriptions, forget to verify the email ID, resulting in feeds not getting delivered and the feed count remaining the same. Keith from Techie-Buzz has developed an useful plugin to notify unverified readers about this fact and remind them to verify their email address.
This plugin is called Notify Unconfirmed Subscribers Plugin. After installing, this plugin will ask your Feedburner User ID and password and logs in to your account to get the email address of all the unverified email subscribers. After that it gives an option to compose a mail to all the pending readers.
When I checked my feed burner statistics, I found that there were around 38 email subscriptions which were not verified and this accounted to around 40% of total email subscriptions. So I decided to install the plugin and email all the readers who had not confirmed. By the time I write this post I could see an increase in feed count of 25.
This plugin is really useful if you have a big list of unverified readers and its really painful to send a mail to them individually.
You can download and try this plugin and see an increase in your feed count.