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.

kilozwo

Simply notifies comment-author via email if someone replies to his comment. Zero Configuration.

Comment Email Reply

One of these nice and nifty plugins that eases life.



Simply do the job :)

Good

Simply notifies comment-author via email if someone replies to his comment. Zero Configuration.

Comment Reply Notification vs Comment Email Reply