No. For example, I have a .org email domain. In order to make this work, everybody involved, that is dns, email hoster and various dbs, ssl certs infra, browser

No. For example, I have a .org email domain. In order to make this work, everybody involved, that is dns, email hoster and various dbs, ssl certs infra, browsers and email apps, they all need to properly resolve my .org domain. It's unrealistic to expect all these parties to suddenly respect the new dns resolver.