Scott Reilly

This plugin adds a checkbox to the profile page for users which allows them to opt into receiving a notification email whenever a comment is made to the site.
If a comment goes into moderation, only users who have the ability to manage comments on the site will receive the moderation notification email.
By default, all users of the site have the ability to subscribe to notifications about comments. A filter is provided to facilitate use of code to customize the feature’s availability to users.
Note: a “user” is a person with an actual login account for the site. The plugin does not facilitate permitting visitors who do not have an account on the site to be able to subscribe to all comments.
Links: <a href="http://coffee2code.com/wp-plugins/optin-comment-notifications/" rel="nofollow ugc">Plugin Homepage</a> | <a href="https://wordpress.org/plugins/optin-comment-notifications/" rel="ugc">Plugin Directory Page</a> | <a href="https://github.com/coffee2code/optin-comment-notifications/" rel="nofollow ugc">GitHub</a> | <a href="http://coffee2code.com" rel="nofollow ugc">Author Homepage</a>

Optin Comment Notifications

Checkboxes on user profiles to receive emails about new comments. Like it says.

Exactly what you want

Allows users to opt into receiving a notification email whenever a comment is made to the site.

gossiped

Gossiped Comments replaces the default WordPress commenting system with a powerful, universal commenting platform that works across multiple websites.
Key Features:
<ul>
<li>Cross-Site Profiles – Users maintain one profile across all sites using Gossiped</li>
<li>Reputation System – Build reputation through quality comments and engagement</li>
<li>Real-Time Analytics – Track comment activity, user engagement, and site performance</li>
<li>Spam Protection – Built-in spam filtering and moderation tools</li>
<li>Modern Interface – Clean, responsive design with light/dark themes</li>
<li>Nested Replies – Unlimited reply depth with threaded conversations</li>
<li>Upvote/Downvote – Community-driven content rating</li>
<li>Live Activity Tracking – See who’s viewing and commenting in real-time</li>
<li>Email Notifications – Notify users of replies and new comments</li>
<li>Per-Post Control – Enable/disable comments on individual posts</li>
<li>Easy Moderation – Powerful admin tools to moderate, ban, and suspend users</li>
</ul>
Why Gossiped?
Traditional WordPress comments are isolated to each site. With Gossiped, your commenters build a reputation across the web, encouraging quality discussions and reducing spam.
How It Works:
<ol>
<li>Install and activate the plugin</li>
<li>Create a free account at <a href="https://gossiped.com/register" rel="nofollow ugc">Gossiped.com</a></li>
<li>Add your site and get your API key</li>
<li>Enter the API key in WordPress settings</li>
<li>Comments automatically appear on your posts</li>
</ol>
Privacy & Data:
<ul>
<li>Comments are stored on Gossiped’s secure servers</li>
<li>Full GDPR compliance</li>
<li>Users control their own data and profiles</li>
<li>No tracking scripts or cookies without consent</li>
</ul>
<h3>Privacy Policy</h3>
Gossiped Comments connects to the Gossiped API (gossiped.com) to store and retrieve comments. When users comment, the following data is sent to Gossiped:
<ul>
<li>User’s name and email (if provided)</li>
<li>Comment content</li>
<li>Page URL and title</li>
<li>IP address (for spam protection)</li>
<li>User agent string</li>
</ul>
This data is stored on Gossiped’s secure servers. Users can delete their data at any time through their Gossiped account.
For full privacy details, see: https://gossiped.com/privacy
<h3>Support</h3>
For support, please visit: 
* Support Forum: https://gossiped.com/support 
* Documentation: https://gossiped.com/docs 
* Email: support@gossiped.com

Gossiped Comments

Universal commenting system with cross-site profiles, reputation scores, and real-time analytics.

Optin Comment Notifications vs Gossiped Comments