Today, encryption of email is mainly implemented only between server and client: When client sends and receives email, they are connected to their email server through TLS. This involves two third parties: The email server itself, and the certificate authority which issues TLS certificate for the email server. This encryption does not follow the above workflow that I have suggested.

While the above workflow can be implemented using GPG, the lack of popularity and automated tools for GPG integration with email makes this workflow practical only to enthusiasts.
spam fails_task lang_mismatch pii not_appropriate hate_speech sexual_content quality toxicity humor helpfulness creativity violence