[l72]

But that puts all the data on a 3rd party site where I _might_ be able to make a copy of it for myself. It is annoying to get an email from my bank about an "important message", and instead of just sending me the message, I now have to go to the bank's app to read it. Oh, and it disappears after 30 days, so I have no way to archive it or look back on important messages from a year ago.

A government system could easily implement s/mime transparently for all emails sent within that system (meaning any other government agency or registered providers).