“Reply” function on comments now automatically includes the email
notification for everybody that received the original comment’s email
notification (if it was sent), excluding the person posting the reply.
I means that when somebody posts a comment and sends an email notification about it to a group of people…
… when “Reply” is clicked on that comment:
…the people included in the original email notification will automatically be included into the reply comment email notification (the author of the post being excluded):
This makes it easier to exchange comments with email notifications with a group of people or just answer directly to the person that posted a comment for you — the way “reply” works with emails.