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).

webdevstudios

Michael Beckwith

pluginize

Brian Messenlehner

Prevent users and bots from accessing the BuddyPress or bbPress areas of your website(s) until they are approved.
This BuddyPress extension allows you to enable user moderation for new members, as well as help create a private network for your users. If moderation is enabled, any new members will be denied access to your BuddyPress and bbPress areas on your site, with the exception of their own user profile. They will be allowed to edit and configure that much. They will also not be listed in the members lists on the frontend until approved. Custom messages are available so you can tailor them to the tone of your website and community. When an admin approves or denies a user, email notifications will be sent to let them know of the decision.
Requires BuddyPress version 1.7 or higher and bbPress 2.0 or higher.
<h3>General Data Protection Regulation</h3>
BuddyPress Registration Options temporarily stores user IP addresses as user meta to help validate and vet pending users. Saved IP values are deleted upon both approval and denial of pending user. No other personal data is recorded.

Registration Options for BuddyPress

Moderate new BuddyPress members and fight BuddyPress spam.

Comment Approval Notification vs Registration Options for BuddyPress