This plugin for sent information about comment to post author. 
Information about author name and author e-mails sets in custom fields for each post. 
In configuration of plugin you can set keys name for custom fields. By default this is “Author name” and “Author email”. 
Also can set subject and body of notification e-mail. 
In body of e-mail you can use macros:
[name] – name of authr from custom field 
[url] – post url 
[title] – post title 
[comment] – comment text

Comment Inform

This plugin for sent information about comment to post author. Infromation about authors gets from custom fields. Custom fields keys are "Author  …

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Notify all WordPress users (and not only the admin) on every comment approval. The notification is only sent once after the first comment post approving action (and not on possible status update).

WP Comment Notifier For All

Notify all Wordpress users (and not only the admin) on every comment approval.

Comment Inform vs WP Comment Notifier For All