Android email sharing is implemented and has passed recorded checks in the v3 release candidate. Open your mail app from the finished dictation card or Reader, send text in the email body or attach TXT, Markdown or PDF, and set a default recipient and subject in Settings.
An optional setting opens your mail app after each completed dictation; you still review and send the email yourself. iPhone, Windows and macOS email workflows are separate work. Public Android availability and a release date have not been confirmed.