Germany winding down De-Mail is a useful reminder: secure email projects do not succeed just because they have legal backing or official branding.
For users, the hard parts are trust, daily usability, clear threat models, and what data still sits with the provider.
Private email should be honest about those tradeoffs instead of hiding behind a seal of approval.
https://www.heise.de/en/background/De-Mail-Delivery-Fiction-with-Pitfalls-11305293.html
