replyPUSH

Much like WordPress.com’s “Comment Reply via Email”, you can reply to any post you subscribe to.
Integrates with the wonderful <a href="https://wordpress.org/plugins/subscribe2/" title="subscribe2" rel="ugc">subscribe2</a> and <a href="http://replypush.com" title="replyPUSH.com" rel="nofollow ugc">replyPUSH.com</a> service to provide the email reply magic.
It automatically adds notifications for comment posts to keep the conversation flowing 🙂
All the subscriber need do, is reply at the top of their quoted email notification.

Reply By Email

Allows your users to reply to articles / blog posts and comments via email.

Pippin Williamson

Remi Corson

This add-on plugin for bbPress will allow your forum posters to mark their replies as private, meaning that only the original poster and forum moderators can see the content of the reply. This is a great plugin to install if you use bbPress as a support forum where users may need to share confidential information, such as site URLs, passwords, etc.
If you have suggestions or bugfixes for the plugin, please report them on <a href="https://github.com/pippinsplugins/bbPress-Private-replies" rel="nofollow ugc">Github</a>.
Languages
Private Replies for bbPress as been translated into the following languages:
<ol>
<li>English</li>
<li>French</li>
<li>German</li>
<li>Dutch</li>
</ol>
Would you like to help translate the plugin into more languages? <a href="http://pippinsplugins.com/contact" rel="nofollow ugc">Contact Pippin</a>.

bbPress – Private Replies

A simple plugin to allow your bbPress users to mark their replies as private.

Reply By Email vs bbPress – Private Replies