In reply to Julio Potier.

Of course this plugin is great because it has a lot more use cases. I just want to add a different solution for local WordPress communities. As there are no non-english channels possible on "Making WordPress" Slack this was our solution to avoid inviting every single person. Of course this just works if you have a shared domain for your mails. As a company you can whitelist your company domain to whitelist every mail with this domain. So maybe this is a solution for some other use cases too.