More thoughts:
* Perhaps in low-risk situations the original poster could also click-through and approve replies.
* One would set up accounts with screening services and link them to a fedi account. The original poster's server would forward the messages for approval.
* I think this could be done with only changes to the original poster's server, not the reply-guy server. It would be nice if the reply server knew of the screening to warn the person replying.
4/x (almost done)