Mailboxer Gem

I want to implement messaging in my app and I see that the most recent commits to the mailboxes gem say it no longer works in newer Rails versions. If it's not still relevant, then is there a new gem I should be looking at?

I think I've seen any new gems for messaging since Mailboxer.

What parts of it doesn't work in Rails 6?

I don't know yet :) I was just doing a little research before I spend time working on it and your vid suggests using the latest from GitHub. When I checked the Github repo I checked out the latest commit messages first.