[@bhammondcvl Participant 8 years, 7 months ago]

No worries–I am looking forward to a nice weekend myself. Here are some more, possibly useful, details:

I installed bbPress on another, far more generic, site and got the same behavior–bounced messages to no-reply@site-name if any user had subscribed to a forum or topic.

I installed the plugin “bbPress Custom Topic & Reply Notifications” by Pippin Williamson and got its customized notifications, but also the no-reply bounces.

I deactivated that and installed “bbPress Notify (No-Spam)” by Vinny Alves, which said it provided the ability to override bbPress’s default subscription functions. Using this plugin seems to have resolved the bounces.

So it would seem to be a problem with bbPress’s subscriptions functions, and not a conflict with some other plugin or some other site-specific oddity.