John James Jacoby

Matt Mullenweg

Samuel Wood (Otto)

It’s hard to keep up with a private blog because there’s no good way to subscribe to it. Subscription plugins aren’t great because generally you have a finite number of people you want to get to it and asking each one to do a double-opt-in is annoying, and you still wouldn’t have anything for comments.
This hooks into the new comment and new post actions to send an email to the addresses you enter, so it’s easy to follow the entire conversation even if it’s comments on someone else’s blog posts.

Notifly

Send notification emails of all new posts and new comments to everyone on a list. Great for private blogs.

antonpug

This plugin adds a customizable Better Follow Button at bottom right corner of your Jetpack-powered WordPress.org site.
The plugins integrates with the built in subscription manager of the Jetpack Plugin to collect the email of the subscriber and handle distribution of new posts via email.
NOTE: This plugin requires the Jetpack plugin to be installed & activated
For further information visit the plugin website.

Better Follow Button for Jetpack

Adds a floating subscription button (like on WordPress.com sites) to Jetpack-powered WordPress.org sites.

Notifly vs Better Follow Button for Jetpack