When you update the status of a Post, you'll see this option to "Notify all voters":
If you save with notifications enabled, voters will get a custom-branded email like this:
Note: There is an unsubscribe link at the bottom if they wish to stop receiving updates like these.
If a user replies directly to the email, the reply is not recorded on the Post.
They need to click the "View Post" button in the email to add their comments or navigate to the Post page.
This is an easy way to notify everyone of progress on a feature they care about. Closing the feedback loop has never been more simple!