Regarding
I’d also like to keep in mind
For now, in my community, I am changing the email button text from “Read Message” to “View Recipients”.
I feel like pushing users to the site should be the main objective while trying to avoid the pitfalls.
I posted some email footer enhancements tips for Reply Privately and other features using existing Discourse shortcodes and Customize Text. I didn’t check any of the group email templates or related email text but maybe some of the codes are already present or could be implemented in a similar way.