denishua

When a reply is made to a comment the user has left on the blog, an e-mail shall be sent to the user to notify him of the reply. This will allow the users to follow up the comment and expand the conversation if desired. 
Detail information: http://theme10.com/comment-reply-notification/
中文介绍： http://fairyfish.net/2008/11/03/comment-reply-notification/

Comment Reply Notification

When a reply is made to a comment the user has left on the blog, an e-mail shall be sent to the user to notify him of the reply.

Eduardo de Oliveira

It’s sent a automatic message to the comment author when his/her comment receive a reply.
Support URL: http://euqueroaprender.ismywebsite.com/wordpress/plugins/reply-comment-to-email/

Reply Comment to Email

It’s sent a automatic message to the comment author when his/her comment receive a reply.

Comment Reply Notification vs Reply Comment to Email