Here I was pining over the loss of my favorite
Mail.app plugin (MsgFiler) after having upgraded to macOS Sonoma when I come across this blog post on their site that points out that you can actually do a similar (but far less polished thing) by invoking the
Help menu with
Command-Shift-/ and typing the target folder name.
It’s pretty snappy since it’s baked in to the OS, but since I have multiple
activity name/2023 folders (over 20 years of them) it’s not as slick as MsgFiler to do partial matches or typeahead find (plus it causes the application menu to bounce around all over the place).
But it works, and that’s what matters.