Here are a few options:
bbPress Messages: This plugin offers a simple yet powerful private messaging system tailored specifically for bbPress. It includes features like message caching for faster performance, background processing for tasks such as email notifications, and support for shortcodes and widgets.
JA.WORDPRESS.ORG
Better Messages: A comprehensive real-time private messaging system compatible with bbPress, BuddyPress, and other WordPress platforms. It provides features like live chat, file uploads, emoji support, message editing and deleting, and even audio and video calls.
JA.WORDPRESS.ORG
bbPress – Private Replies: This plugin allows forum participants to mark their replies as private, meaning only the original poster and forum moderators can view the content. It’s particularly useful for support forums where users may need to share confidential information.
