Speedboxer

The Comment Approval Notification plugin will send an email to the comment author when you approve their comment. The email sent is fully customizable, with shortcodes, through a settings page.
Please note that this plugin has only been tested with PHP 5.2.x.
A full list of available shortcodes is available <a href="http://mattsblog.ca/plugins/comment-approval-notification/#shortcodes" title="Available Shortcodes" rel="nofollow ugc">here</a>.

Comment Approval Notification

Sends an email to the comment author when their comment gets approved (only if it's held for moderation).

royalnavneet

<ul>
<li>Website Comment Cleaner – Delete All Comments, Disable Comments, Bulk Delete & Remove Comments** helps you delete, export, import, and disable comments on your WordPress site using an admin dashboard with bulk actions and filters.</li>
</ul>
This plugin supports: 
* Deleting comments by status (approved, pending, spam, trash, or all). 
* Optional date-range filtering when bulk deleting. 
* Exporting comments to CSV and importing comments from CSV. 
* Disabling comments globally or by selected post types. 
* Role-based exclusions and scheduled spam cleanup.
<h3>Features</h3>
<ul>
<li>Export comments to CSV from the plugin dashboard.</li>
<li>Import comments from CSV.</li>
<li>Schedule automatic spam cleanup (daily, weekly, monthly).</li>
<li>Configure role-based exclusions and post-type comment settings.</li>
</ul>

Comment Cleaner — Bulk Delete & Disable Comments

Delete, export, import, and manage WordPress comments with bulk tools and comment-control settings.

Comment Approval Notification vs Comment Cleaner — Bulk Delete & Disable Comments